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Docs: LCL/forms. Updates content in TControlScrollBar, TScrollingWinControl, TScrollBox topics.
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@ -325,9 +325,9 @@ client area, equivalent to the top coordinate of the slider. The Position can
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be changed by the user or by code.
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</p>
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<p>
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Scroll bars usually appear only when Range is higher than Page, i.e. when the
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entire content cannot be shown at the same time. See the scroll bar
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properties in <var>TScrollingWinControl</var> for more details.
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Scroll bars usually appear only when Range is larger than Page, i.e. when the
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entire content cannot be shown in the visible area for a control. See the
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scroll bar properties in <var>TScrollingWinControl</var> for more details.
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</p>
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</descr>
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<seealso>
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@ -388,7 +388,7 @@ including:
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<element name="TControlScrollBar.GetAutoScroll">
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<short>
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The AutoScroll state for the associated TScrollingWinControl control.
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Gets the AutoScroll state for the associated TScrollingWinControl control.
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</short>
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<descr>
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<remark>
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@ -758,8 +758,8 @@ sets the default values for properties, including:
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<dd>Set to 8.</dd>
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<dt>Position and Range</dt>
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<dd>Set to 0 (zero).</dd>
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<dt>Smooth and Tracking</dt>
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<dd>Set to <b>False</b>.</dd>
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<dt>Smooth, Tracking</dt>
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<dd>Both are set to <b>False</b>.</dd>
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<dt>Visible</dt>
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<dd>Set to <b>True</b>.</dd>
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</dl>
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@ -847,14 +847,33 @@ instance.
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</element>
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<element name="TControlScrollBar.Size">
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<short>The adjustable size of the scroll bar.</short>
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<short>Height or width for the scroll bar.</short>
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<descr>
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<p>
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The length of the bar is the Width (or Height) of the Parent Control, the
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Size is the other (free) coordinate.
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<var>Size</var> is a read-only <var>Integer</var> property with the width or
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height in pixels for the scroll bar indicated in the Kind property. For a
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horizontal scroll bar (Kind is sbHorizontal), the return value is the height
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of the scroll bar. Conversely, for a vertical scroll bar (Kind is sbVertical)
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the value is the width of the scroll bar.
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</p>
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<p>
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Size calls the GetScrollbarSize routine in the LCL interface to get the
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return value when the Handle for the control has been allocated. Otherwise,
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the GetSystemMetrics method in the widgetset class is called to get
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the return value.
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</p>
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<p>
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Use ControlSize, ClientSize, ClientSizeWithBar, and ClientSizeWithoutBar methods to get the control or client width for the control.
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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="TControlScrollBar.Kind"/>
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<link id="TControlScrollBar.ControlSize"/>
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<link id="TControlScrollBar.ClientSize"/>
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<link id="TControlScrollBar.ClientSizeWithBar"/>
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<link id="TControlScrollBar.ClientSizeWithoutBar"/>
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<link id="TScrollBarKind"/>
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</seealso>
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</element>
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<element name="TControlScrollBar.ControlSize">
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@ -982,14 +1001,15 @@ methods in <var>TScrollingWinControl</var>.
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<element name="TControlScrollBar.Increment">
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<short>
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The small Position increment, applicable to the scroll bar arrows.
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Number of pixels the display area is scrolled for scroll bar or mouse wheel
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movements.
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</short>
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<descr>
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<p>
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<var>Increment</var> is a <var>TScrollBarInc</var> property which indicates
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the amount the client area in the associated control is scrolled when the
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<b>Up</b> or <b>Down</b> navigation arrows on the scroll bar are clicked. The
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default value is <b>8</b>.
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<b>Up</b> or <b>Down</b> navigation arrows on the scroll bar are clicked. It is also used for movements of the mouse wheel on the control. The default
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value is <b>8</b> pixels.
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</p>
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<p>
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The value in Increment may be automatically recalculated in the
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@ -1044,14 +1064,26 @@ control, such as:
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<element name="TControlScrollBar.Page">
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<short>
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The slider size, position increment applicable to the scroll bar area beneath
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the slider.
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Number of pixels needed for a page on the associated control.
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</short>
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<descr>
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<p>
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The amount by which the scroll indicator moves if the cursor selects the
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scroll bar above, below or on either side of the scroll indicator. The
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default value is 80.
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<var>Page</var> is a <var>TScrollBarInc</var> property with the number of
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pixels needed for a page using the orientation in Kind for the scroll bar.
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This is the amount that the associated control is scrolled when the track bar
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or direction indicators are clicked on the scroll bar. The default value for
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the property is 80 pixels.
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</p>
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<p>
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When the associated control is a TScrollingWinControl descendant, the scroll
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information is retrieved using the Handle for the control. The property value
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may be changed when the associated control calls its UpdateScrollbars method.
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This can occur when the handle is created for the associated control, or when
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its AutoScroll property is changed.
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</p>
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<p>
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Changing the value for the property causes the ControlUpdateScrollBars method
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to be called to update the scroll bars in the associated control.
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</p>
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</descr>
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<seealso/>
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@ -1090,7 +1122,7 @@ The default value for the property is <b>False</b>.
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</element>
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<element name="TControlScrollBar.Position">
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<short>Position of the slider, 0..Range-Page.</short>
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<short>Position of the scroll bar slider in the range 0..Range-Page.</short>
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<descr>
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<p>
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The Position reflects the top coordinate of the slider, which is Range-Page
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@ -1101,19 +1133,44 @@ when the slider is at the bottom of the bar.
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</element>
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<element name="TControlScrollBar.Range">
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<short>The virtual size of the Parent Control.</short>
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<short>
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The size of the logical display area on the associated control for the scroll
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bar orientation.
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</short>
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<descr>
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<p>
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<var>Range</var> is an <var>Integer</var> property with the number of pixels
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needed for the logical display area on the control where the scroll bar is
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used. It measures the size of the scrolled content in the direction indicated
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by the Kind property. The default value for the property is 0, and indicates
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the dimensions for the scrollable content is smaller than the Page size for
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the scroll bar.
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</p>
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<p>
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The values in Range and other properties are updated when the associated
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control recalculates sizes and positions for its scroll bars.
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</p>
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<p>
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Use Position to determine the origin for the scrollable content displayed in
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the visible area on the associated control.
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</p>
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<p>
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Use Page to determine the number of pixels along the scroll bar orientation
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needed for the visible area on the associated control.
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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="TControlScrollBar.Tracking">
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<short>Gives feedback while the slider is dragged.</short>
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<short>
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Enables feedback when the slider is dragged.
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</short>
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<descr>
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<p>
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When it takes a significant amount of time to repaint the parent control at a
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new position, Tracking should be <b>False</b> to prevent flicker. This causes
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the control to be updated only when the slider is released.
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If it takes a significant amount of time to repaint the associated control at
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a new position, Tracking should be set to <b>False</b> to prevent flicker.
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This causes the control to be updated when the slider is released.
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</p>
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</descr>
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<seealso>
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@ -1124,15 +1181,14 @@ the control to be updated only when the slider is released.
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<short>Hides the scroll bar when <b>False</b> (default <b>True</b>).</short>
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<descr>
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<p>
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The scroll bar widget is visible only if (Visible=True) <b>and</b>
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(Range>Page).
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The scroll bar is visible only if (Visible = True) <b>and</b>
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(Range > Page).
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</p>
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<p>
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Set Visible to <b>False</b> to disallow the user to scroll the content, while
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the content still can be scrolled by code.
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Set Visible to <b>False</b> to hide the scroll bar. The content on the associated control can still be scrolled in program code.
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</p>
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<p>
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Use IsScrollBarVisible to get the current visible state of the widget.
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Use IsScrollBarVisible to get the current visible state for the scroll bar.
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</p>
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</descr>
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<seealso>
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@ -1141,7 +1197,7 @@ Use IsScrollBarVisible to get the current visible state of the widget.
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</element>
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<element name="TScrollingWinControl">
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<short>Class of a windowed control with incorporated scroll bars.</short>
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<short>Implements a windowed control with scroll bars.</short>
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<descr>
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<p>
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This class introduces a logical (virtual) client area, part of which is
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@ -1191,21 +1247,21 @@ progress.
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<element name="TScrollingWinControl.AlignControls">
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<short>
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Aligns the controls which have the class instance as their parent.
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Aligns the controls which have the class instance as their Parent.
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</short>
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<descr>
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<p>
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Calls the inherited method to align the specified control and its children to
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the parent control. Ensures that the page, range, and position in the scroll
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bars are recalculated when <var>AutoScroll</var> is enabled and both
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<var>HorzScrollBar</var> and <var>VertScrollBar</var> are in use.
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<var>HorzScrollBar</var> and <var>VertScrollBar</var> are assigned.
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</p>
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</descr>
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<seealso>
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<link id="TScrollingWinControl.AutoScroll"/>
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<link id="TScrollingWinControl.HorzScrollBar"/>
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<link id="TScrollingWinControl.VertScrollBar"/>
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<link id="#LCL.Controls.TWinControl.AlignControls">TWinControl.AlignControls</link>
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<link id="#lcl.controls.TWinControl.AlignControls">TWinControl.AlignControls</link>
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</seealso>
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</element>
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<element name="TScrollingWinControl.AlignControls.AControl">
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@ -1227,7 +1283,7 @@ a dock site by an active docking manager.
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<p>
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Use the <var>AutoSize</var> property to enabled or disable automatic control
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resizing. Set the <var>UseDockManager</var> property to <b>False</b> to
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disable use of the <var>DockSite</var> for the control.
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disable using the control as a <var>DockSite</var> for other controls.
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</p>
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</descr>
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<seealso>
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@ -1243,9 +1299,16 @@ disable use of the <var>DockSite</var> for the control.
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</element>
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<element name="TScrollingWinControl.CalculateAutoRanges">
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<short>Sets or resets the ranges used for scroll bars in the control.</short>
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<short>Sets or resets the ranges used for scroll bars on the control.</short>
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<descr>
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<p>
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<var>CalculateAutoRanges</var> calculates the preferred size for the control
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- both with and without scroll bars. The Range properties in HorzScrollBar
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and VertScrollBar are updated to reflect the logical (virtual) size for the
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content on the control. The Range value is set to 0 if the scroll bar is not
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visible.
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</p>
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<p>
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Used in the implementation of the ComputeScrollbars method.
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</p>
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</descr>
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@ -1253,6 +1316,8 @@ Used in the implementation of the ComputeScrollbars method.
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<link id="TScrollingWinControl.ComputeScrollbars"/>
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<link id="TScrollingWinControl.HorzScrollBar"/>
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<link id="TScrollingWinControl.VertScrollBar"/>
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<link id="TScrollingWinControl.GetPreferredSizeClientFrame"/>
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<link id="#lcl.controls.TControl.GetPreferredSize">TControl.GetPreferredSize</link>
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</seealso>
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</element>
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@ -1260,7 +1325,7 @@ Used in the implementation of the ComputeScrollbars method.
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<short>Creates the window handle for the control.</short>
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<descr>
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<p>
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Ensures that the scroll bar page, range, and visibility are established when
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Ensures that the scroll bar page, range, and visibility are assigned when
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the handles for the windowed control are created. Temporarily disables
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auto-sizing in the method, and re-enables auto-sizing prior to exit. Calls
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the inherited method to create the window and its handles.
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@ -1276,18 +1341,30 @@ the inherited method to create the window and its handles.
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<short>The origin for the physical client area.</short>
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<descr/>
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<seealso>
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<link id="#LCL.Controls.TControl.GetClientScrollOffset">TControl.GetClientScrollOffset</link>
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<link id="#lcl.controls.TControl.GetClientScrollOffset">TControl.GetClientScrollOffset</link>
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</seealso>
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</element>
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<element name="TScrollingWinControl.GetClientScrollOffset.Result">
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<short>The scroll bar Positions, or (0,0) if no scroll bars in use.</short>
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<short>The scroll bar Positions, or (0,0) if scroll bars are not used.</short>
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</element>
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<element name="TScrollingWinControl.GetLogicalClientRect" link="#lcl.controls.TControl.GetLogicalClientRect">
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<short>Returns the full virtual ClientRect.</short>
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<descr/>
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<element name="TScrollingWinControl.GetLogicalClientRect">
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<short>Returns the logical size of the client area on the control.</short>
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<descr>
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<p>
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<var>GetLogicalClientRect</var> is an overridden method in
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<var>TScrollingWinControl</var>; it re-implements the method introduced in
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the ancestor class. The return value contains the value in the ClientRect
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property. It ensures that the Right and Bottom members in the return value
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are updated (when needed) to reflect the current Range values for the
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respective visible scroll bars.
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</p>
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</descr>
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<seealso>
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<link id="TControlScrollBar.Visible"/>
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<link id="TControlScrollBar.Range"/>
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<link id="#lcl.controls.TControl.GetLogicalClientRect">TControl.GetLogicalClientRect</link>
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<link id="#lcl.controls.TControl.ClientRect">TControl.ClientRect</link>
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</seealso>
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</element>
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<element name="TScrollingWinControl.GetLogicalClientRect.Result">
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@ -1297,11 +1374,30 @@ the control.
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</short>
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</element>
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<element name="TScrollingWinControl.DoOnResize" link="#lcl.controls.TControl.DoOnResize">
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<short>Also updates scroll bars if needed.</short>
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<descr/>
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<element name="TScrollingWinControl.DoOnResize">
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<short>Performs actions needed when the control has been resized.</short>
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<descr>
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<p>
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<var>DoOnResize</var> is an overridden method in
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<var>TScrollingWinControl</var>. It calls the inherited method on entry to
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signal the OnResize event handler (when assigned). Other OnResize handlers
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for the application are also signalled.
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</p>
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<p>
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When AutoScroll is enabled, the UpdateScrollbars method is called to
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recalculate the page, range, and visibility for the scroll bars on the
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control. This action is <b>not</b> performed if either VertScrollBar or
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HorzScrollBar has not been assigned.
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</p>
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</descr>
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<seealso>
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<link id="TScrollingWinControl.AutoScroll"/>
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<link id="TScrollingWinControl.UpdateScrollbars"/>
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<link id="TScrollingWinControl.VertScrollBar"/>
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<link id="TScrollingWinControl.HorzScrollBar"/>
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<link id="#lcl.controls.TControl.DoOnResize">TControl.DoOnResize</link>
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<link id="#lcl.controls.TControl.OnResize">TControl.OnResize</link>
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<link id="#lcl.controls.TControl.DoCallNotifyHandler">TControl.DoCallNotifyHandler</link>
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</seealso>
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</element>
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@ -1441,7 +1537,7 @@ to compute the page, auto ranges, and visibility for the scroll bars when
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<link id="TScrollingWinControl.HorzScrollBar"/>
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<link id="TScrollingWinControl.VertScrollBar"/>
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<link id="TScrollingWinControl.UpdateScrollBars"/>
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<link id="#LCL.Controls.TWinControl.Loaded">TWinControl.Loaded</link>
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<link id="#lcl.controls.TWinControl.Loaded">TWinControl.Loaded</link>
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</seealso>
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</element>
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@ -1542,20 +1638,80 @@ prior to exiting from the method.
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</seealso>
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</element>
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<element name="TScrollingWinControl.ScreenToClient" link="#lcl.controls.TControl.ScreenToClient"/>
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<element name="TScrollingWinControl.ScreenToClient">
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<short>
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Converts the specified screen coordinates to client-relative coordinates.
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</short>
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<descr>
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<p>
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<var>ScreenToClient</var> is an overridden method in
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<var>TScrollingWinControl</var>.
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</p>
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<p>
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ScreenToClient calls the inherited method to get the TPoint instance with the
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client coordinates used in the return value. The X and Y members in the
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return value are updated to reflect the current scroll offsets for the
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control. This gives the origin on the logical display area for the visible
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area on the control.
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</p>
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<p>
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ScreenToClient is used, along with ClientToScreen, in inherited methods which
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respond to changes in the mouse pointer position for a control. This includes
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context menu display and drag-and-dock operations.
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</p>
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</descr>
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<seealso>
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<link id="TScrollingWinControl.ClientToScreen"/>
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<link id="#lcl.controls.TControl.ScreenToClient">TControl.ScreenToClient</link>
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</seealso>
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</element>
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<element name="TScrollingWinControl.ScreenToClient.Result">
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<short/>
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<short>
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TPoint instance with the client-relative coordinates for the specified value.
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</short>
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</element>
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<element name="TScrollingWinControl.ScreenToClient.APoint">
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<short/>
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<short>
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TPoint instance with the screen coordinates converted in the method.
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</short>
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</element>
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<element name="TScrollingWinControl.ClientToScreen" link="#lcl.controls.TControl.ClientToScreen"/>
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<element name="TScrollingWinControl.ClientToScreen">
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<short>
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Converts the specified client coordinates to absolute screen coordinates.
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</short>
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<descr>
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<p>
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<var>ClientToScreen</var> is an overridden method in
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<var>TScrollingWinControl</var>.
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</p>
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<p>
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ClientToScreen calls the inherited method to get the TPoint instance with the
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screen coordinates for the client coordinates in APoint. The X and Y members
|
||||
in the return value are updated to reflect the current scroll offsets for the
|
||||
control. This gives the screen coordinates where the origin for the logical
|
||||
display area is located on the control.
|
||||
</p>
|
||||
<p>
|
||||
ClientToScreen is used, along with ScreenToClient, in inherited methods which
|
||||
respond to changes in the mouse pointer position for a control. This includes
|
||||
context menu display and drag-and-dock operations.
|
||||
</p>
|
||||
</descr>
|
||||
<seealso>
|
||||
<link id="TScrollingWinControl.ScreenToClient"/>
|
||||
<link id="#lcl.controls.TControl.ClientToScreen">TControl.ClientToScreen</link>
|
||||
</seealso>
|
||||
</element>
|
||||
<element name="TScrollingWinControl.ClientToScreen.Result">
|
||||
<short/>
|
||||
<short>
|
||||
TPoint instance with the screen coordinates for the specified value.
|
||||
</short>
|
||||
</element>
|
||||
<element name="TScrollingWinControl.ClientToScreen.APoint">
|
||||
<short/>
|
||||
<short>
|
||||
TPoint instance with the client-relative coordinates converted in the method.
|
||||
</short>
|
||||
</element>
|
||||
|
||||
<element name="TScrollingWinControl.UpdateScrollbars">
|
||||
@ -1569,7 +1725,7 @@ on the windowed control.
|
||||
When automatic scrollbars are enabled using AutoScroll, the scroll bar
|
||||
information is initialized as needed for the visible scroll bars. The
|
||||
UpdateScrollBar method in both VertScrollBar and HorzScrollBar is called to
|
||||
recalculate the current page and range in the scroll bars.
|
||||
recalculate the current page and range for the scroll bars.
|
||||
</p>
|
||||
<p>
|
||||
No actions are performed in the method if a handle has not been allocated for
|
||||
@ -1577,7 +1733,7 @@ the control, or when either HorzScrollBar or VertScrollBar has not been
|
||||
assigned.
|
||||
</p>
|
||||
<p>
|
||||
Recursive calls to the method are also ignored.
|
||||
Recursive calls to the method are ignored.
|
||||
</p>
|
||||
</descr>
|
||||
<seealso>
|
||||
@ -1695,10 +1851,33 @@ and <var>AutoScroll</var> is enabled.
|
||||
<descr>
|
||||
<p>
|
||||
<var>TScrollBox</var> is a <var>TScrollingWinControl</var> descendant that
|
||||
implements a windowed control with scroll bars. TScrollBox sets the
|
||||
visibility for properties inherited from the ancestor class. TScrollBox
|
||||
includes an overridden constructor which sets the default values for
|
||||
properties in the class instance.
|
||||
implements a windowed control with scroll bars. It uses the logical and
|
||||
physical display areas introduced in the ancestor class, and allows a
|
||||
scrollable area to be displayed on a form or panel. The logical (or virtual)
|
||||
client area represents the dimensions needed for the child Controls added to
|
||||
the class instance. When the logical display area is larger than the visible
|
||||
area for the control, scroll bars allow the content to be moved into the
|
||||
visible area for the control.
|
||||
</p>
|
||||
<p>
|
||||
TScrollBox sets the visibility for properties inherited from the ancestor
|
||||
class. TScrollBox includes an overridden constructor which sets the default
|
||||
values for properties in the class instance.
|
||||
</p>
|
||||
<p>
|
||||
Child Controls can be added to the class instance at design-time, or at
|
||||
run-time by setting the scroll box as the Parent for a control.
|
||||
</p>
|
||||
<p>
|
||||
The AutoScroll property indicates whether the scroll bars are automatically
|
||||
displayed (or hidden) as needed when the control is resized, or when child
|
||||
Controls are updated. This includes setting the page, range, and visibility
|
||||
for the scroll bars. Use the HorzScrollBar and VertScrollBar properties to
|
||||
access scroll bar page, range, and visibility when AutoScroll is not enabled.
|
||||
</p>
|
||||
<p>
|
||||
An example application using TScrollBox is located in the
|
||||
<file>examples/imgviewer</file> directory.
|
||||
</p>
|
||||
</descr>
|
||||
<seealso>
|
||||
@ -2205,7 +2384,7 @@ a Parent.
|
||||
</short>
|
||||
<descr/>
|
||||
<seealso>
|
||||
<link id="#LCL.Controls.TWinControl.GetChildren">TWinControl.GetChildren</link>
|
||||
<link id="#lcl.controls.TWinControl.GetChildren">TWinControl.GetChildren</link>
|
||||
</seealso>
|
||||
</element>
|
||||
<element name="TCustomFrame.GetChildren.Proc">
|
||||
@ -3979,7 +4158,7 @@ auto-sizing is performed for <var>Controls</var>.
|
||||
</p>
|
||||
</descr>
|
||||
<seealso>
|
||||
<link id="#LCL.Controls.TWinControl.AdjustClientRect">TWinControl.AdjustClientRect</link>
|
||||
<link id="#lcl.controls.TWinControl.AdjustClientRect">TWinControl.AdjustClientRect</link>
|
||||
</seealso>
|
||||
</element>
|
||||
<element name="TCustomForm.AdjustClientRect.Rect">
|
||||
@ -4352,7 +4531,7 @@ ParentFormHandleInitialized method is also called.
|
||||
</p>
|
||||
</descr>
|
||||
<seealso>
|
||||
<link id="#LCL.Controls.TWinControl.ChildHandlesCreated">TWinControl.ChildHandlesCreated</link>
|
||||
<link id="#lcl.controls.TWinControl.ChildHandlesCreated">TWinControl.ChildHandlesCreated</link>
|
||||
</seealso>
|
||||
</element>
|
||||
|
||||
@ -5226,7 +5405,7 @@ properties for the form instance, including:
|
||||
<ul>
|
||||
<li>Sets the FormState to fsFirstShow and calls BeginFormUpdate.</li>
|
||||
<li>Sets the default BorderIcons for the form.</li>
|
||||
<li>Sets the FormStyle, ControlsStyle, and BorderStyle for the form.</li>
|
||||
<li>Sets the FormStyle, ControlStyle, and BorderStyle for the form.</li>
|
||||
<li>Calls the inherited Create constructor.</li>
|
||||
<li>Sets the default bounds for the form instance.</li>
|
||||
<li>Sets Visible to <b>False</b>.</li>
|
||||
@ -17600,7 +17779,7 @@ assigned as event handler routines for the TCustomForm instance in TheOwner.
|
||||
</seealso>
|
||||
</element>
|
||||
<element name="TFormPropertyStorage.Create.TheOwner">
|
||||
<short>TCustomForm instance which owns th class instance.</short>
|
||||
<short>TCustomForm instance which owns the class instance.</short>
|
||||
</element>
|
||||
|
||||
<element name="TFormPropertyStorage.Destroy">
|
||||
|
||||
Loading…
Reference in New Issue
Block a user