page-control: button state auto-updated, + index prop for TCEPage

+ added a project that can be used to devel TCEPageControl without recompiling CE in its whole

lazproj/test/pagecontrol/.gitignore

@@ -0,0 +1 @@
+pagecontrol 

lazproj/test/pagecontrol/pagecontrol.lpi

@@ -0,0 +1,78 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<CONFIG>
+  <ProjectOptions>
+    <Version Value="9"/>
+    <General>
+      <SessionStorage Value="InProjectDir"/>
+      <MainUnit Value="0"/>
+      <Title Value="pagecontrol"/>
+      <ResourceType Value="res"/>
+      <UseXPManifest Value="True"/>
+    </General>
+    <i18n>
+      <EnableI18N LFM="False"/>
+    </i18n>
+    <VersionInfo>
+      <StringTable ProductVersion=""/>
+    </VersionInfo>
+    <BuildModes Count="1">
+      <Item1 Name="Default" Default="True"/>
+    </BuildModes>
+    <PublishOptions>
+      <Version Value="2"/>
+    </PublishOptions>
+    <RunParams>
+      <local>
+        <FormatVersion Value="1"/>
+      </local>
+    </RunParams>
+    <RequiredPackages Count="1">
+      <Item1>
+        <PackageName Value="LCL"/>
+      </Item1>
+    </RequiredPackages>
+    <Units Count="2">
+      <Unit0>
+        <Filename Value="pagecontrol.lpr"/>
+        <IsPartOfProject Value="True"/>
+      </Unit0>
+      <Unit1>
+        <Filename Value="../../pagecontroltester.pas"/>
+        <IsPartOfProject Value="True"/>
+        <ComponentName Value="Form1"/>
+        <ResourceBaseClass Value="Form"/>
+      </Unit1>
+    </Units>
+  </ProjectOptions>
+  <CompilerOptions>
+    <Version Value="11"/>
+    <Target>
+      <Filename Value="pagecontrol"/>
+    </Target>
+    <SearchPaths>
+      <IncludeFiles Value="$(ProjOutDir)"/>
+      <OtherUnitFiles Value="../../../src"/>
+      <UnitOutputDirectory Value="lib/$(TargetCPU)-$(TargetOS)"/>
+    </SearchPaths>
+    <Linking>
+      <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>

lazproj/test/pagecontrol/pagecontrol.lpr

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

lazproj/test/pagecontrol/pagecontroltester.lfm

@@ -0,0 +1,8 @@
+object Form1: TForm1
+  Left = 486
+  Height = 317
+  Top = 193
+  Width = 819
+  Caption = 'Form1'
+  LCLVersion = '1.4.4.0'
+end

lazproj/test/pagecontrol/pagecontroltester.pas

@@ -0,0 +1,72 @@
+unit pagecontroltester;
+
+{$mode objfpc}{$H+}
+
+interface
+
+uses
+  Classes, SysUtils, FileUtil, Forms, Controls, Graphics, Dialogs,
+  ce_controls, ce_sharedres;
+
+type
+  TForm1 = class(TForm)
+  private
+    fPageControl: TCEPageControl;
+    procedure pageControlChanged(sender: TObject);
+    procedure pagePaint(sender: TObject);
+  public
+    constructor create(aOwner: TComponent); override;
+  end;
+
+var
+  Form1: TForm1;
+
+implementation
+{$R *.lfm}
+
+constructor TForm1.create(aOwner: TComponent);
+begin
+  inherited;
+  fPageControl := TCEPageControl.Create(self);
+  fPageControl.Parent := self;
+  fPageControl.Align  := alClient;
+  fPageControl.onChanged:=@pageControlChanged;
+
+  AssignPng(fPageControl.closeButton.Glyph, 'document_delete');
+  AssignPng(fPageControl.addButton.Glyph, 'document_add');
+  AssignPng(fPageControl.moveLeftButton.Glyph, 'document_back');
+  AssignPng(fPageControl.moveRightButton.Glyph, 'document_next');
+end;
+
+procedure TForm1.pageControlChanged(sender: TObject);
+var
+  page: TCEPage;
+begin
+  page := fPageControl.currentPage;
+  if assigned(page) then
+  begin
+    if page.OnPaint = nil then
+    begin
+      page.OnPaint := @pagePaint;
+      page.Repaint;
+    end;
+    if page.Caption = '' then
+      page.Caption := format('<created index %d>', [page.index]);
+  end;
+end;
+
+procedure TForm1.pagePaint(sender: TObject);
+var
+  page: TCEPage = nil;
+begin
+  page := TCEPage(sender);
+  if assigned(page) then
+  begin
+    page.Canvas.Clear;
+    page.Canvas.Font.Size := 22;
+    page.Canvas.TextOut(10, 10, format('current index %d', [page.index]));
+  end;
+end;
+
+end.
+

src/ce_controls.pas

@@ -18,8 +18,12 @@ type
 
   // Used instead of a TTabSheet since only the caption is interesting
   TCEPage = class(TCustomControl)
+  private
+    function getIndex: integer;
   protected
-    procedure RealSetText(const Value: TCaption); override;
+    procedure realSetText(const Value: TCaption); override;
+  public
+    property index: integer read getIndex;
   end;
 
   (**
@@ -61,6 +65,7 @@ type
     function getPage(index: integer): TCEPage;
 
     procedure changedNotify;
+    procedure updateButtonsState;
 
   public
     constructor Create(aowner: TComponent); override;
@@ -89,13 +94,25 @@ type
 
 implementation
 
+function TCEPage.getIndex: integer;
+var
+  ctrl: TCEPageControl;
+  i: integer;
+begin
+  ctrl := TCEPageControl(owner);
+  for i := 0 to ctrl.pageCount-1 do
+      if ctrl.pages[i] = self then
+        exit(i);
+  exit(-1);
+end;
+
 procedure TCEPage.RealSetText(const Value: TCaption);
 var
   i: integer;
   ctrl: TCEPageControl;
 begin
   inherited;
-  ctrl :=  TCEPageControl(Owner);
+  ctrl :=  TCEPageControl(owner);
   i := ctrl.getPageIndex(self);
   if i <> -1 then ctrl.fTabs.Tabs.Strings[i] := caption;
 end;
@@ -164,6 +181,7 @@ begin
   fPageIndex := -1;
 
   fButtons:= CEPageControlDefaultButtons;
+  updateButtonsState;
 end;
 
 destructor TCEPageControl.Destroy;
@@ -176,6 +194,7 @@ end;
 
 procedure TCEPageControl.changedNotify;
 begin
+  updateButtonsState;
   if assigned(fOnChanged) then
     fOnChanged(self);
 end;
@@ -262,7 +281,9 @@ begin
 
   if fPageIndex >= fPages.Count then
     fPageIndex -= 1;
-  if fPages.Count = 0 then exit;
+  updateButtonsState;
+  if fPages.Count = 0 then
+    exit;
 
   setPageIndex(fPageIndex);
 end;
@@ -315,7 +336,6 @@ begin
   setPageIndex(fPageIndex-1);
 end;
 
-
 procedure TCEPageControl.btnCloseClick(sender: TObject);
 begin
   deletePage(fPageIndex);
@@ -338,16 +358,25 @@ end;
 
 procedure TCEPageControl.setButtons(value: TCEPageControlButtons);
 begin
-  fButtons:= value;
-  fHeader.DisableAlign;
+  if fButtons = value then
+    exit;
 
+  fButtons := value;
+  updateButtonsState;
+  fHeader.ReAlign;
+end;
+
+procedure TCEPageControl.updateButtonsState;
+begin
+  fHeader.DisableAlign;
   fCloseBtn.Visible:= pbClose in fButtons;
   fMoveLeftBtn.Visible:= pbMoveLeft in fButtons;
   fCloseBtn.Visible:= pbMoveRight in fButtons;
   fAddBtn.Visible:= pbAdd in fButtons;
-
   fHeader.EnableAlign;
-  fHeader.ReAlign;
+  fCloseBtn.Enabled := fPageIndex <> -1;
+  fMoveLeftBtn.Enabled := fPageIndex > 0;
+  fMoveRightBtn.Enabled := fPageIndex < fPages.Count-1;
 end;
 
 end.