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Docs: LCL/calcform. Updates content in various topics.
(cherry picked from commit 586323470e)
This commit is contained in:
dsiders
parent
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commit
a8e9f489b7
@ -62,7 +62,9 @@ changed.
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</element>
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<element name="TCalculatorState">
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<short/>
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<short>
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Represents status values used in TCalculatorPanel.
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</short>
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<descr>
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<p>
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<var>TCalculatorState</var> is an enumerated type with values that represent
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@ -76,19 +78,27 @@ type used to implement the <var>Status</var> property in
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</seealso>
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</element>
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<element name="TCalculatorState.csFirst">
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<short>Value on the First key press.</short>
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<short>
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Value when an initial key press or button click has not yet been detected and
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applied to a calculator panel.
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</short>
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</element>
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<element name="TCalculatorState.csValid">
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<short>
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Value after the operation for the key has been applied successfully.
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Value after an operation for a key press or mouse click has been successfully
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applied.
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</short>
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</element>
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<element name="TCalculatorState.csError">
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<short>Value when the operation resulted in an error.</short>
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<short>
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Value when an operation results in an error condition for a calculator panel.
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</short>
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</element>
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<element name="TCalculatorLayout">
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<short/>
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<short>
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Represents layouts used for panels on a TCalculatorForm instance.
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</short>
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<descr>
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<p>
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<var>TCalculatorLayout</var> is an enumerated type with values that represent
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@ -105,11 +115,15 @@ methods in <var>TCalculatorForm</var> and <var>TCalculatorPanel</var>.
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</element>
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<element name="TCalculatorLayout.clNormal">
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<short>
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The default layout with larger button sizes and more whitespace.
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The default layout with larger button sizes, more whitespace, and buttons for
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common calculator operations like Back, Clear, Ok and Cancel.
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</short>
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</element>
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<element name="TCalculatorLayout.clSimple">
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<short>The compact layout with smaller button sizes.</short>
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<short>
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The compact layout with smaller buttons using equally sized sizes. Some buttons
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like Back, Clear, Ok and Cancel are omitted in the simple layout.
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</short>
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</element>
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<element name="TCalculatorPanel">
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@ -160,29 +174,56 @@ Ensures that Text is updated and displayed when Status is csFirst.
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<element name="TCalculatorPanel.CalcKey">
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<short>
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Performs actions for a key press not handled by a button in the calculator
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panel.
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Performs actions for a key press notification in the calculator panel.
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</short>
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<descr/>
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<seealso/>
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<seealso>
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<link id="TCalculatorPanel.CalcKeyPress"/>
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<link id="TCalculatorForm.OnKeyPress"/>
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<link id="TCalculatorCalcKeyEvent"/>
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</seealso>
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</element>
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<element name="TCalculatorPanel.CalcKey.Key">
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<short/>
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<short>
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Character value for the key pressed.
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</short>
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</element>
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<element name="TCalculatorPanel.Clear">
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<short>Clears the display and operator in the calculator panel.</short>
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<descr/>
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<seealso/>
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<descr>
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<p>
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Called when the Clear button on the panel is clicked, or when the 'C' key is
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pressed. Sets the display text to '0/0' and causes the OnDisplayChange event
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handler to be notified. Resets the OperatorChar property to '='.
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</p>
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</descr>
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<seealso>
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<link id="TCalculatorPanel.OnDisplayChange"/>
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<link id="TCalculatorPanel.OperatorChar"/>
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<link id="TCalculatorPanel.CalcKeyPress"/>
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</seealso>
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</element>
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<element name="TCalculatorPanel.Error">
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<short>
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Updates the calculator panel to reflect an error condition, and signals
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OnError.
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Updates the calculator panel to reflect an error condition and signals the
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OnError event handler.
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</short>
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<descr/>
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<seealso/>
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<descr>
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<p>
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Changes the text displayed on the panel to the value in the rsError resource
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string and updates the Status property to csError. Calls ErrorBeep to produce
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an error beep when enabled in BeepOnError. Signals the OnError event handler
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(when assigned).
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</p>
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</descr>
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<seealso>
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<link id="TCalculatorPanel.Status"/>
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<link id="TCalculatorPanel.ErrorBeep"/>
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<link id="TCalculatorPanel.BeepOnError"/>
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<link id="TCalculatorPanel.OnError"/>
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</seealso>
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</element>
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<element name="TCalculatorPanel.SetDisplay">
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@ -203,7 +244,9 @@ OnDisplayChange.
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<seealso/>
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</element>
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<element name="TCalculatorPanel.GetDisplay.Result">
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<short/>
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<short>
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Textual representation for DisplayValue using the Precision for the panel.
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</short>
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</element>
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<element name="TCalculatorPanel.FindButton">
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@ -249,43 +292,104 @@ Translates a mouse click on a button to the character key used in CalcKey.
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</element>
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<element name="TCalculatorPanel.ErrorBeep">
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<short/>
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<short>
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Produces an error tone when enabled using the BeepOnError property.
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</short>
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<descr>
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ErrorBeep is an empty implementation in the current LCL version.
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<p>
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ErrorBeep has an empty implementation in the current LCL version. No error tone
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is produced.
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</p>
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</descr>
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<seealso/>
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</element>
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<element name="TCalculatorPanel.TextChange">
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<short>
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Sets the display text for the associated control and signals OnTextChange.
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Sets the display text for the calculator panel and signals OnTextChange.
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</short>
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<descr/>
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<seealso/>
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<seealso>
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<link id="TCalculatorPanel.OnTextChange"/>
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</seealso>
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</element>
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<element name="TCalculatorPanel.CreateLayout">
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<short>
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Initializes and configures the calculator panel using the specified layout.
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</short>
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<descr/>
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<seealso/>
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<descr>
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<p>
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<var>CreateLayout</var> is a constructor for the class instance. It calls the
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inherited Create constructor on entry, and sets the default values for
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properties.
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</p>
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<p>
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<var>AOwner</var> is the component which owns the class instance (the
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TCalculatorForm instance).
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</p>
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<p>
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<var>ALayout</var> specifies both the position and size for the buttons on the
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panel. It affects the Width and Height for the panel as well.
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</p>
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<p>
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CreateLayout creates the calculator buttons and positions them on the panel for
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the specified layout. When clNormal is used in ALayout, buttons are created for
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Back, Clear, Ok and Cancel. clNormal also causes a panel used for Memory
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display to be created and positioned.
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</p>
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<p>
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CreateLayout is called from the InitForm method in TCalculatorForm.
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</p>
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</descr>
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<seealso>
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<link id="TCalculatorPanel.Memory"/>
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<link id="TCalculatorForm.InitForm"/>
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<link id="TCalculatorLayout"/>
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<link id="#lcl.extctrls.TCustomPanel.Create">TCustomPanel.Create</link>
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</seealso>
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</element>
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<element name="TCalculatorPanel.CreateLayout.AOwner">
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<short/>
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<short>
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Component which owns the class instance.
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</short>
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</element>
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<element name="TCalculatorPanel.CreateLayout.ALayout">
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<short/>
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<short>
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Layout applied to the panel and its buttons.
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</short>
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</element>
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<element name="TCalculatorPanel.CalcKeyPress">
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<short>
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Locates the button using the specified Key and perform its Click method.
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Applies a key or button press to the calculator panel.
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</short>
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<descr>
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CalcKey is called when a button is located using the specified Key.
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<p>
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CalcKeyPress is a method used to implement the OnKeyPress event handler for the
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TCalculatorForm instance where the panel is displayed.
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</p>
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<p>
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<var>Sender</var> is the object instance (TCalculatorForm) for the event
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notification.
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</p>
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<p>
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<var>Key</var> is the character value for the key (or button) for the
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notification. If Key is the caption for one of the buttons on the panel, its
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Click method is called. Otherwise, the private CalcKey method is called to
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apply the Key value.
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</p>
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<p>
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CalcKeyPress is called by a TCalculatorForm instance when its OnKeyPress event
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handler is executed.
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</p>
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</descr>
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<seealso/>
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<seealso>
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<link id="TCalculatorPanel.OnCalcKey"/>
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<link id="TCalculatorForm.InitForm"/>
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<link id="#lcl.forms.TForm.OnKeyPress">TForm.OnKeyPress</link>
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<link id="#lcl.buttons.TCustomSpeedButton.Click">TCustomSpeedButton.Click</link>
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</seealso>
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</element>
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<element name="TCalculatorPanel.CalcKeyPress.Sender">
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<short>Object for the KeyPress event.</short>
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@ -295,48 +399,105 @@ CalcKey is called when a button is located using the specified Key.
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</element>
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<element name="TCalculatorPanel.Copy">
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<short>Loads the value in Text into the Clipboard as a text value.</short>
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<descr/>
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<seealso/>
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<short>Loads the value in Text into the Clipboard as plain text.</short>
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<descr>
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<p>
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Called when the Copy context menu item for a TCalculatorForm instance is
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clicked.
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</p>
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</descr>
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<seealso>
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<link id="TCalculatorPanel.Paste"/>
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</seealso>
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</element>
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<element name="TCalculatorPanel.Paste">
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<short>
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Pastes text from the Clipboard into the text display for the calculator panel.
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</short>
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<descr/>
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<seealso/>
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<descr>
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<p>
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Called when the Paste context menu item for a TCalculatorForm instance is
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clicked.
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</p>
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</descr>
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<seealso>
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<link id="TCalculatorPanel.DisplayValue"/>
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<link id="TCalculatorPanel.Copy"/>
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</seealso>
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</element>
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<element name="TCalculatorPanel.WorkingPrecision">
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<short>
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Gets the minimum number of precision digits allowable for the panel.
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Gets the minimum number of precision digits allowed for the DisplayValue on
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the panel.
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</short>
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<descr/>
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<seealso/>
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<descr>
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<p>
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<var>WorkingPrecision</var> is an <var>Integer</var> function used to get the
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number of decimal digits used to format the DisplayValue on the panel. The
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minimum precision used for the floating point value is 2, but can be increased
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by setting the value for the Precision property.
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</p>
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</descr>
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<seealso>
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<link id="TCalculatorPanel.Precision"/>
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<link id="TCalculatorPanel.DisplayValue"/>
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</seealso>
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</element>
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<element name="TCalculatorPanel.WorkingPrecision.Result">
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<short/>
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<short>
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Number of decimal digits displayed for the floating point DisplayValue.
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</short>
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</element>
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<element name="TCalculatorPanel.UpdateMemoryLabel">
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<short>
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Updates the Memory indicator to reflect a non-zero value in the Memory
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Updates the Memory indicator to reflect a non-zero value present in the Memory
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property.
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</short>
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<descr/>
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<seealso/>
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<descr>
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<p>
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Causes the character 'M' to be displayed when Memory has a non-zero value.
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Otherwise, the Memory indicator is cleared.
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</p>
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</descr>
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<seealso>
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<link id="TCalculatorPanel.Memory"/>
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</seealso>
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</element>
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<element name="TCalculatorPanel.DisplayValue">
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<short>Contains the Double value representing the Text in the panel.</short>
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<descr/>
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<seealso/>
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<short>
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Contains the Double value representing the result (and Text) displayed on the
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calculator panel.
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</short>
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<descr>
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<p>
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<var>DisplayValue</var> is a <var>Double</var> property which contains the
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result for a value entered or calculated using the calculator panel. The
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property value is determined by calling StrToDouble to convert the value in
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Text to a floating point value. The property value is 0.0 if Status contains
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csError.
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</p>
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<p>
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Changing the value for the property causes Text to be updated. The Double value
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is formatted using the Precision needed for the panel, and the OnDisplayChange
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event handler is signalled (when assigned).
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</p>
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</descr>
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<seealso>
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<link id="TCalculatorPanel.Text"/>
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<link id="TCalculatorPanel.Precision"/>
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<link id="TCalculatorPanel.WorkingPrecision"/>
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<link id="TCalculatorPanel.Status"/>
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</seealso>
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</element>
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<element name="TCalculatorPanel.Memory">
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<short>
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Contains the Double value stored in the memory for the calculator.
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Contains the Double value stored as the memory for the calculator panel.
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</short>
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<descr/>
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<seealso/>
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@ -344,20 +505,25 @@ Contains the Double value stored in the memory for the calculator.
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<element name="TCalculatorPanel.Precision">
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<short>
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Maximum number of digits of precision allowed for the Double value in the
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calculator.
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Number of digits used after the decimal for the Double value in the calculator
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panel.
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</short>
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<descr/>
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<seealso/>
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<seealso>
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<link id="TCalculatorPanel.WorkingPrecision"/>
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</seealso>
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</element>
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<element name="TCalculatorPanel.BeepOnError">
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<short>
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Indicates if a beep occurs when an error condition is detected in the
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Indicates whether a beep occurs when an error condition is detected in the
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calculator panel.
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</short>
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<descr/>
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<seealso/>
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<seealso>
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<link id="TCalculatorPanel.Status"/>
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<link id="TCalculatorPanel.ErrorBeep"/>
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</seealso>
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</element>
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<element name="TCalculatorPanel.Status">
|
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@ -365,78 +531,162 @@ calculator panel.
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Contains the status or state for the calculator panel.
|
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</short>
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<descr>
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<p>
|
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<var>Status</var> is a <var>TCalculatorState</var> property which indicate the
|
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state for the calculator panel. Values from the TCalculatorState enumeration
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are applied to the property when the panel is updated for key presses or mouse
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clicks.
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</p>
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<p>
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<var>csError</var> indicates an error condition was detected, and causes 0.0 to
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be returned in the DisplayValue for the panel.
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</p>
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</descr>
|
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<seealso/>
|
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<seealso>
|
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<link id="TCalculatorPanel.CalcKeyPress"/>
|
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<link id="TCalculatorPanel.DisplayValue"/>
|
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<link id="TCalculatorPanel.BeepOnError"/>
|
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<link id="TCalculatorPanel.ErrorBeep"/>
|
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<link id="TCalculatorState"/>
|
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</seealso>
|
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</element>
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|
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<element name="TCalculatorPanel.OperatorChar">
|
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<short>
|
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Character representing the last operator entered in the calculator panel.
|
||||
Character representing the last operator entered using the calculator panel.
|
||||
</short>
|
||||
<descr/>
|
||||
<seealso/>
|
||||
<seealso>
|
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<link id="TCalculatorPanel.CalcKeyPress"/>
|
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</seealso>
|
||||
</element>
|
||||
|
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<element name="TCalculatorPanel.Text">
|
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<short>Text representation for the Double value in the calculator.</short>
|
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<descr/>
|
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<seealso/>
|
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<short>
|
||||
Text representation for the Double display value on the calculator panel.
|
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</short>
|
||||
<descr>
|
||||
<p>
|
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<var>Text</var> is a read-only <var>String</var> property in
|
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<var>TCalculatorPanel</var> with the textual representation for the
|
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DisplayValue on the panel. It contains the text formatted using the Precision
|
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needed for the DisplayValue. Text is updated when a new value is assigned to
|
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DisplayValue, when CalcKeyPress is executed for the panel, or when methods for
|
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Error or Clear buttons are called.
|
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</p>
|
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</descr>
|
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<seealso>
|
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<link id="TCalculatorPanel.DisplayValue"/>
|
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<link id="TCalculatorPanel.CalcKeyPress"/>
|
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</seealso>
|
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</element>
|
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|
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<element name="TCalculatorPanel.OnOkClick">
|
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<short/>
|
||||
<short>
|
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Event handler signalled when the OK button on the calculator panel has been
|
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clicked.
|
||||
</short>
|
||||
<descr/>
|
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<seealso/>
|
||||
</element>
|
||||
|
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<element name="TCalculatorPanel.OnCancelClick">
|
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<short/>
|
||||
<short>
|
||||
Event handler signalled when the Cancel button on the calculator form has been
|
||||
clicked, or the form is closed using the Close window decoration or an
|
||||
accelerator key.
|
||||
</short>
|
||||
<descr/>
|
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<seealso/>
|
||||
</element>
|
||||
|
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<element name="TCalculatorPanel.OnResultClick">
|
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<short/>
|
||||
<short>
|
||||
Event handler signalled when the Enter key, = or % operators are clicked on the
|
||||
panel.
|
||||
</short>
|
||||
<descr/>
|
||||
<seealso/>
|
||||
</element>
|
||||
|
||||
<element name="TCalculatorPanel.OnError">
|
||||
<short/>
|
||||
<short>
|
||||
Event handler signalled when the Error method is called for the calculator
|
||||
panel.
|
||||
</short>
|
||||
<descr/>
|
||||
<seealso/>
|
||||
</element>
|
||||
|
||||
<element name="TCalculatorPanel.OnTextChange">
|
||||
<short/>
|
||||
<short>
|
||||
Event handler signalled when a new value has been assigned to the Text for the
|
||||
panel.
|
||||
</short>
|
||||
<descr/>
|
||||
<seealso/>
|
||||
</element>
|
||||
|
||||
<element name="TCalculatorPanel.OnCalcKey">
|
||||
<short/>
|
||||
<short>
|
||||
Event handler signalled when a key press is applied to the calculator panel.
|
||||
</short>
|
||||
<descr/>
|
||||
<seealso/>
|
||||
</element>
|
||||
|
||||
<element name="TCalculatorPanel.OnDisplayChange">
|
||||
<short/>
|
||||
<short>
|
||||
Event handler signalled following a change to the DisplayValue for the
|
||||
calculator panel.
|
||||
</short>
|
||||
<descr/>
|
||||
<seealso/>
|
||||
</element>
|
||||
|
||||
<element name="TCalculatorPanel.Color">
|
||||
<short>Color for the calculator panel.</short>
|
||||
<descr/>
|
||||
<short>
|
||||
Background color for the calculator panel.
|
||||
</short>
|
||||
<descr>
|
||||
<p>
|
||||
<var>Color</var> is a <var>TColor</var> property with the background color used
|
||||
for the calculator panel. It is redefined in TCalculatorPanel to use clBtnFace
|
||||
as the default value for the property. Please note to ParentColor is ultimately
|
||||
set to <b>True</b> for the panels on a TCalculatorForm instance.
|
||||
</p>
|
||||
</descr>
|
||||
<seealso/>
|
||||
</element>
|
||||
|
||||
<element name="TCalculatorForm">
|
||||
<short>
|
||||
Implements the form used to display a calculator in a TCalculatorDialog.
|
||||
Implements the form used to display a calculator for a TCalculatorDialog
|
||||
instance.
|
||||
</short>
|
||||
<descr/>
|
||||
<seealso/>
|
||||
<descr>
|
||||
<p>
|
||||
<var>TCalculatorForm</var> is a <var>TForm</var> descendant which implements
|
||||
the form used to display a calculator. It extends the ancestor class with
|
||||
properties, methods, and events needed to configure and display the form
|
||||
instance with UI elements needed for either a simple (compact) or a normal
|
||||
calculator layout. Use the Create constructor to control the layout for the
|
||||
calculator form instance.
|
||||
</p>
|
||||
<p>
|
||||
Use the Value property to set or get the value displayed on the calculator.
|
||||
</p>
|
||||
<p>
|
||||
Use the OnCalcKey and OnDisplayChange event handlers to perform actions needed
|
||||
when keys are pressed or the display value is changed on the form instance.
|
||||
</p>
|
||||
</descr>
|
||||
<seealso>
|
||||
<link id="TCalculatorForm.Create"/>
|
||||
<link id="TCalculatorForm.Value"/>
|
||||
<link id="TCalculatorPanel"/>
|
||||
<link id="#lcl.forms.TForm">TForm</link>
|
||||
</seealso>
|
||||
</element>
|
||||
|
||||
<element name="TCalculatorForm.FMainPanel"/>
|
||||
@ -485,7 +735,9 @@ Performs actions needed to handle OnKeyPress events in the calculator form.
|
||||
<seealso/>
|
||||
</element>
|
||||
<element name="TCalculatorForm.PasteItemClick.Sender">
|
||||
<short/>
|
||||
<short>
|
||||
Object instance for the click notification.
|
||||
</short>
|
||||
</element>
|
||||
|
||||
<element name="TCalculatorForm.SetValue">
|
||||
@ -503,7 +755,9 @@ Performs actions needed to handle OnKeyPress events in the calculator form.
|
||||
<seealso/>
|
||||
</element>
|
||||
<element name="TCalculatorForm.OkClick.Sender">
|
||||
<short/>
|
||||
<short>
|
||||
Object instance for the click notification.
|
||||
</short>
|
||||
</element>
|
||||
|
||||
<element name="TCalculatorForm.CancelClick">
|
||||
@ -566,7 +820,10 @@ Performs actions needed for a key received in the calculator form.
|
||||
</element>
|
||||
|
||||
<element name="TCalculatorForm.MainPanel">
|
||||
<short/>
|
||||
<short>
|
||||
TPanel instance used as a container for the display and button panels on the
|
||||
calculator form.
|
||||
</short>
|
||||
<descr/>
|
||||
<seealso/>
|
||||
</element>
|
||||
@ -608,11 +865,43 @@ Event handler signalled when the calculator display has been changed.
|
||||
</element>
|
||||
|
||||
<element name="CreateCalculatorForm">
|
||||
<short>Creates and configures a new TCalculatorForm instance.</short>
|
||||
<descr/>
|
||||
<short>
|
||||
Creates, configures, and returns a new TCalculatorForm instance.
|
||||
</short>
|
||||
<descr>
|
||||
<p>
|
||||
<var>CreateCalculatorForm</var> is a <var>TCalculatorForm</var> function used
|
||||
to create and configure a new calculator form instance using the arguments
|
||||
passed to the routine.
|
||||
</p>
|
||||
<p>
|
||||
<var>ALayout</var> determines the number, type, position, and size for buttons
|
||||
on the calculator form. It is passed as argument to the TCalculatorForm.Create
|
||||
constructor used to instantiate the return value. See
|
||||
<link id="TCalculatorLayout">TCalculatorLayout</link> for more information on
|
||||
the layout values.
|
||||
</p>
|
||||
<p>
|
||||
AHelpContext contains the help context identifier assigned to the HelpContext
|
||||
property in the form instance.
|
||||
</p>
|
||||
<p>
|
||||
CreateCalculatorForm ensures that the form instance is scaled to the PPI
|
||||
setting for the Screen, and updates Left and Top to center the form on the
|
||||
Screen display area. If an exception occurs during this operation the form
|
||||
instance is freed, and the return value is <b>Nil</b>. The exception is
|
||||
re-raised to perform exception handling enabled in the application.
|
||||
</p>
|
||||
<p>
|
||||
CreateCalculatorForm is called from methods in TCalcEdit and TCalculatorDialog
|
||||
when the form instance is created for the controls.
|
||||
</p>
|
||||
</descr>
|
||||
<seealso>
|
||||
<link id="TCalculatorForm"/>
|
||||
<link id="TCalculatorLayout"/>
|
||||
<link id="#lcl.editbtn.TCalcEdit.RunDialog">TCalcEdit.RunDialog</link>
|
||||
<link id="#lcl.extdlgs.TCalculatorDialog.Execute">TCalculatorDialog.Execute</link>
|
||||
</seealso>
|
||||
</element>
|
||||
<element name="CreateCalculatorForm.Result">
|
||||
@ -624,9 +913,10 @@ Event handler signalled when the calculator display has been changed.
|
||||
<element name="CreateCalculatorForm.ALayout">
|
||||
<short>Layout for the calculator panel in the form instance.</short>
|
||||
</element>
|
||||
|
||||
<element name="CreateCalculatorForm.AHelpContext">
|
||||
<short/>
|
||||
<short>
|
||||
Help context for the newly created form instance in the return value.
|
||||
</short>
|
||||
</element>
|
||||
|
||||
<element name="cColorBtnDigits">
|
||||
@ -678,19 +968,19 @@ Event handler signalled when the calculator display has been changed.
|
||||
</element>
|
||||
|
||||
<element name="cCalculatorFontName">
|
||||
<short>Font name used for buttons and displays in a calculator.</short>
|
||||
<short>Font name used for buttons and text displays in a calculator.</short>
|
||||
<descr/>
|
||||
<seealso/>
|
||||
</element>
|
||||
|
||||
<element name="cCalculatorFontSize">
|
||||
<short>Font size used for buttons and displays in a calculator.</short>
|
||||
<short>Font size used for buttons and text displays in a calculator.</short>
|
||||
<descr/>
|
||||
<seealso/>
|
||||
</element>
|
||||
|
||||
<element name="cCalculatorFontStyle">
|
||||
<short>Font style used for buttons and displays in a calculator.</short>
|
||||
<short>Font style used for buttons and text displays in a calculator.</short>
|
||||
<descr/>
|
||||
<seealso/>
|
||||
</element>
|
||||
|
||||
Loading…
Reference in New Issue
Block a user