Example for OnResize event order from Mike Sapsard. Issue #27386.

git-svn-id: trunk@47653 -

.gitattributes

@@ -4509,6 +4509,10 @@ docs/xml/lcl/xmlpropstorage.xml svneol=LF#text/xml eol=lf
 docs/xml/mkhtml.bat svneol=native#text/plain
 docs/xml/multi_makeskel.pl svneol=native#text/plain
 docs/xml/updateXML.bat svneol=native#text/plain
+examples/ReSizeImageDemo/project1.lpi svneol=native#text/plain
+examples/ReSizeImageDemo/project1.lpr svneol=native#text/pascal
+examples/ReSizeImageDemo/unit1.lfm svneol=native#text/plain
+examples/ReSizeImageDemo/unit1.pas svneol=native#text/pascal
 examples/SynEdit/Completion/README.txt svneol=native#text/plain
 examples/SynEdit/Completion/SynCompletionSample.ico -text
 examples/SynEdit/Completion/SynCompletionSample.lpi svneol=native#text/plain

examples/ReSizeImageDemo/project1.lpi

@@ -0,0 +1,88 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<CONFIG>
+  <ProjectOptions>
+    <Version Value="9"/>
+    <General>
+      <SessionStorage Value="InProjectDir"/>
+      <MainUnit Value="0"/>
+      <Title Value="project1"/>
+      <ResourceType Value="res"/>
+      <UseXPManifest Value="True"/>
+      <Icon Value="0"/>
+    </General>
+    <i18n>
+      <EnableI18N LFM="False"/>
+    </i18n>
+    <VersionInfo>
+      <StringTable ProductVersion=""/>
+    </VersionInfo>
+    <BuildModes Count="1">
+      <Item1 Name="Default" Default="True"/>
+    </BuildModes>
+    <PublishOptions>
+      <Version Value="2"/>
+      <DestinationDirectory Value="/home/mike/Documents/projects/ReSizeImageDemo/Published"/>
+    </PublishOptions>
+    <RunParams>
+      <local>
+        <FormatVersion Value="1"/>
+      </local>
+    </RunParams>
+    <RequiredPackages Count="1">
+      <Item1>
+        <PackageName Value="LCL"/>
+      </Item1>
+    </RequiredPackages>
+    <Units Count="2">
+      <Unit0>
+        <Filename Value="project1.lpr"/>
+        <IsPartOfProject Value="True"/>
+      </Unit0>
+      <Unit1>
+        <Filename Value="unit1.pas"/>
+        <IsPartOfProject Value="True"/>
+        <ComponentName Value="Form1"/>
+        <HasResources Value="True"/>
+        <ResourceBaseClass Value="Form"/>
+        <UnitName Value="Unit1"/>
+      </Unit1>
+    </Units>
+  </ProjectOptions>
+  <CompilerOptions>
+    <Version Value="11"/>
+    <Target>
+      <Filename Value="project1"/>
+    </Target>
+    <SearchPaths>
+      <IncludeFiles Value="$(ProjOutDir)"/>
+      <UnitOutputDirectory Value="lib/$(TargetCPU)-$(TargetOS)"/>
+    </SearchPaths>
+    <CodeGeneration>
+      <SmartLinkUnit Value="True"/>
+    </CodeGeneration>
+    <Linking>
+      <Debugging>
+        <GenerateDebugInfo Value="False"/>
+      </Debugging>
+      <LinkSmart Value="True"/>
+      <Options>
+        <Win32>
+          <GraphicApplication Value="True"/>
+        </Win32>
+      </Options>
+    </Linking>
+  </CompilerOptions>
+  <Debugging>
+    <Exceptions Count="3">
+      <Item1>
+        <Name Value="EAbort"/>
+      </Item1>
+      <Item2>
+        <Name Value="ECodetoolError"/>
+      </Item2>
+      <Item3>
+        <Name Value="EFOpenError"/>
+      </Item3>
+    </Exceptions>
+  </Debugging>
+</CONFIG>

examples/ReSizeImageDemo/project1.lpr

@@ -0,0 +1,21 @@
+program project1;
+
+{$mode objfpc}{$H+}
+
+uses
+  {$IFDEF UNIX}{$IFDEF UseCThreads}
+  cthreads,
+  {$ENDIF}{$ENDIF}
+  Interfaces, // this includes the LCL widgetset
+  Forms, Unit1
+  { you can add units after this };
+
+{$R *.res}
+
+begin
+  RequireDerivedFormResource := True;
+  Application.Initialize;
+  Application.CreateForm(TForm1, Form1);
+  Application.Run;
+end.
+

examples/ReSizeImageDemo/unit1.lfm

@@ -0,0 +1,103 @@
+object Form1: TForm1
+  Left = 236
+  Height = 413
+  Hint = 'Click Checkboxes to select the redraw'#10'events, then resize the form.'
+  Top = 162
+  Width = 572
+  Caption = 'Image Resize Demo'
+  ClientHeight = 413
+  ClientWidth = 572
+  OnClose = FormClose
+  OnCreate = FormCreate
+  OnResize = FormResize
+  ShowHint = True
+  LCLVersion = '1.5'
+  object Pnl1: TPanel
+    Left = 0
+    Height = 63
+    Top = 350
+    Width = 572
+    Align = alBottom
+    ClientHeight = 63
+    ClientWidth = 572
+    TabOrder = 0
+    object CheckBoxImage: TCheckBox
+      Left = 168
+      Height = 22
+      Top = 0
+      Width = 167
+      Caption = 'Redraw on Image resize'
+      TabOrder = 0
+    end
+    object CheckBoxPanel: TCheckBox
+      Left = 168
+      Height = 22
+      Top = 16
+      Width = 160
+      Caption = 'Redraw on Panel resize'
+      TabOrder = 1
+    end
+    object CheckBoxForm: TCheckBox
+      Left = 168
+      Height = 22
+      Top = 32
+      Width = 160
+      Caption = 'Redraw on Form resize'
+      TabOrder = 2
+    end
+    object Button1: TButton
+      Left = 32
+      Height = 25
+      Hint = 'Clear Memo text'
+      Top = 16
+      Width = 96
+      Caption = 'Clear Memo'
+      OnClick = Button1Click
+      TabOrder = 3
+    end
+  end
+  object Pnl2: TPanel
+    Left = 0
+    Height = 350
+    Top = 0
+    Width = 160
+    Align = alLeft
+    Caption = 'Pnl2'
+    ClientHeight = 350
+    ClientWidth = 160
+    TabOrder = 1
+    object Memo1: TMemo
+      Left = 1
+      Height = 348
+      Hint = 'Displays event order. '#10'Clears every 200 lines.'
+      Top = 1
+      Width = 158
+      Align = alClient
+      Lines.Strings = (
+        'Memo1'
+      )
+      ScrollBars = ssAutoBoth
+      TabOrder = 0
+    end
+  end
+  object PnlImage: TPanel
+    Left = 160
+    Height = 350
+    Top = 0
+    Width = 412
+    Align = alClient
+    Caption = 'PnlImage'
+    ClientHeight = 350
+    ClientWidth = 412
+    TabOrder = 2
+    OnResize = PnlImageResize
+    object Image1: TImage
+      Left = 1
+      Height = 348
+      Top = 1
+      Width = 410
+      Align = alClient
+      OnResize = Image1Resize
+    end
+  end
+end

examples/ReSizeImageDemo/unit1.pas

@@ -0,0 +1,153 @@
+unit Unit1;
+
+{$mode objfpc}{$H+}
+
+{Author: Mike Sapsard, 2015.
+ License: GPL3.
+
+ LCL demo of redraw event order for images, panels and forms. it should work
+ for all widget sets eg Windows, qt, OSX, GTK etc.
+
+ Repaint or Invalidate are not needed for resizing events.}
+
+interface
+
+uses
+  {$ifdef Windows} Windows, {$Endif}Classes, SysUtils, FileUtil,
+  Forms, Controls, Graphics, Dialogs, ExtCtrls,
+  StdCtrls, Buttons;
+
+type
+
+  { TForm1 }
+
+  TForm1 = class(TForm)
+    Button1: TButton;
+    CheckBoxImage: TCheckBox;
+    CheckBoxPanel: TCheckBox;
+    CheckBoxForm: TCheckBox;
+    Image1: TImage;
+    Memo1: TMemo;
+    Pnl1: TPanel;
+    Pnl2: TPanel;
+    PnlImage: TPanel;
+    procedure Button1Click(Sender: TObject);
+    procedure FormClose(Sender: TObject; var CloseAction: TCloseAction);
+    procedure FormCreate(Sender: TObject);
+    procedure FormResize(Sender: TObject);
+    procedure Image1Resize(Sender: TObject);
+    procedure PnlImageResize(Sender: TObject);
+  private
+    { private declarations }
+  public
+    { public declarations }
+  end;
+
+var
+  Form1: TForm1;
+  Bitmap: TBitmap;
+
+implementation
+
+{$R *.lfm}
+
+{ TForm1 }
+
+procedure TForm1.FormCreate(Sender: TObject);
+begin
+  Form1.DoubleBuffered := True;      //Stop flickering on some widget sets
+  Bitmap := TBitmap.Create;
+  with Bitmap do
+  begin
+    // Use ClientWidth and ClientHeight so that code works across widget sets
+    // eg Windows, qt, OSX, GTK etc
+    // Height and Width do not allow for widget set and theme borders
+    Width := PnlImage.ClientWidth;
+    Height := PnlImage.ClientHeight;
+    Canvas.brush.color := clBlue;
+    Canvas.Rectangle(0, 0, Image1.ClientWidth, Image1.ClientHeight);
+    Canvas.Font.Size := 20;
+    Canvas.TextOut(15, 170, 'This is the Image');
+  end;
+  Image1.Picture.Graphic := Bitmap; //Assign the bitmap to Image1
+  Memo1.Clear;
+end;
+
+procedure TForm1.FormResize(Sender: TObject);
+begin
+  if CheckBoxForm.Checked then
+  begin
+    with Image1.Picture.Bitmap do
+    begin
+      // Bitmap has a height and width, but these do not change from default,
+      // because a copy is used by Image1.Picture.Bitmap
+      Image1.Picture.Bitmap.SetSize(Image1.ClientWidth, Image1.ClientHeight);
+      // If panel is green, this event was last
+      Canvas.Brush.Color := clGreen;
+      Canvas.Rectangle(0, 0, Image1.ClientWidth, Image1.ClientHeight);
+      Canvas.Font.Color := clYellow;
+      Canvas.Font.Size := 15;
+      Canvas.TextOut(10, 90, 'Form resized');
+    end;
+    Memo1.Lines.Add(IntToStr(Memo1.Lines.Count) + '  Form resized');
+  end;
+  if (Memo1.Lines.Count > 200) then
+    Memo1.Lines.Clear;
+end;
+
+procedure TForm1.Image1Resize(Sender: TObject);
+begin
+  if CheckBoxImage.Checked then
+  begin
+    // Bitmap has a height and width, but these do not change from default,
+    // because a copy is used by Image1.Picture.Bitmap
+    Image1.Picture.Bitmap.SetSize(Image1.ClientWidth, Image1.ClientHeight);
+    with Image1.Picture.Bitmap do
+    begin
+      // If panel is white, this event was last
+      Canvas.Brush.Color := clWhite;
+      Canvas.Rectangle(0, 0, Image1.ClientWidth, Image1.ClientHeight);
+      Canvas.Font.Color := clGreen;
+      Canvas.Font.Size := 15;
+      Canvas.TextOut(10, 10, 'Image resized');
+    end;
+    Memo1.Lines.Add(IntToStr(Memo1.Lines.Count) + '  Image resize');
+  end;
+  if (Memo1.Lines.Count > 200) then
+    Memo1.Lines.Clear;
+end;
+
+procedure TForm1.PnlImageResize(Sender: TObject);
+begin
+  if CheckBoxPanel.Checked then
+  begin
+    // Bitmap has a height and width, but these do not change from default,
+    // because a copy is used by Image1.Picture.Bitmap
+    Image1.Picture.Bitmap.SetSize(Image1.ClientWidth, Image1.ClientHeight);
+    with Image1.Picture.Bitmap do
+    begin
+      // If panel is red, this event was last
+      Canvas.Brush.Color := clRed;
+      Canvas.Rectangle(0, 0, Image1.ClientWidth, Image1.ClientHeight);
+      Canvas.Font.Color := clBlack;
+      Canvas.Font.Size := 15;
+      Canvas.TextOut(10, 50, 'Panel resized');
+    end;
+    Memo1.Lines.Add(IntToStr(Memo1.Lines.Count) + '  Panel resize');
+  end;
+  if (Memo1.Lines.Count > 200) then
+    Memo1.Lines.Clear;
+end;
+
+procedure TForm1.FormClose(Sender: TObject; var CloseAction: TCloseAction);
+begin
+  CloseAction := caFree;
+  Bitmap.Free;
+end;
+
+procedure TForm1.Button1Click(Sender: TObject);
+begin
+  Memo1.Clear;
+end;
+
+end.