From d9a05ba0b96ecac83ccf56279f187984dccb14ae Mon Sep 17 00:00:00 2001
From: skalogryz <skalogryz@8e941d3f-bd1b-0410-a28a-d453659cc2b4>
Date: Sun, 30 Apr 2017 02:22:02 +0000
Subject: [PATCH] richmemo: implementing Redo and CanRedo for Win32

git-svn-id: https://svn.code.sf.net/p/lazarus-ccr/svn@5844 8e941d3f-bd1b-0410-a28a-d453659cc2b4
---
 components/richmemo/richmemo.pas            | 18 ++++++++++++++++++
 components/richmemo/win32/win32richmemo.pas | 16 +++++++++++++++-
 components/richmemo/wsrichmemo.pas          | 14 ++++++++++++++
 3 files changed, 47 insertions(+), 1 deletion(-)

diff --git a/components/richmemo/richmemo.pas b/components/richmemo/richmemo.pas
index 7c5e7fad6..b37802aa4 100644
--- a/components/richmemo/richmemo.pas
+++ b/components/richmemo/richmemo.pas
@@ -203,6 +203,7 @@ type
       CurrentPage: Integer; var AbortPrint: Boolean);
     procedure DoLinkAction(ALinkAction: TLinkAction; const AMouseInfo: TLinkMouseInfo;
       LinkStart, LinkEnd: Integer);
+    function GetCanRedo: Boolean; virtual;
 
   public
     constructor Create(AOwner: TComponent); override;
@@ -257,11 +258,14 @@ type
 
     function CharAtPos(x, y: Integer): Integer;
 
+    procedure Redo; virtual;
+
     property HideSelection : Boolean read fHideSelection write SetHideSelection;
     property OnSelectionChange: TNotifyEvent read fOnSelectionChange write fOnSelectionChange;
     property ZoomFactor: Double read GetZoomFactor write SetZoomFactor;
     property OnPrintAction: TPrintActionEvent read fOnPrintAction write fOnPrintAction;
     property OnLinkAction: TLinkActionEvent read fOnLinkAction write fOnLinkAction;
+    property CanRedo: Boolean read GetCanRedo;
   end;
   
   { TRichMemo }
@@ -1102,6 +1106,14 @@ begin
     Result:=-1;
 end;
 
+function TCustomRichMemo.GetCanRedo: Boolean;
+begin
+  if HandleAllocated then
+    Result:=TWSCustomRichMemoClass(WidgetSetClass).GetCanRedo(Self)
+  else
+    Result:=false;
+end;
+
 function TCustomRichMemo.PrintMeasure(const params: TPrintParams; var est: TPrintMeasure): Boolean;
 begin
   if not Assigned(Printer) then begin
@@ -1117,5 +1129,11 @@ begin
     Result:=false;
 end;
 
+procedure TCustomRichMemo.Redo;
+begin
+  if HandleAllocated then
+    TWSCustomRichMemoClass(WidgetSetClass).Redo(Self);
+end;
+
 end.
 
diff --git a/components/richmemo/win32/win32richmemo.pas b/components/richmemo/win32/win32richmemo.pas
index d68c17c70..ef9f18326 100644
--- a/components/richmemo/win32/win32richmemo.pas
+++ b/components/richmemo/win32/win32richmemo.pas
@@ -136,6 +136,9 @@ type
 
     class function Print(const AWinControl: TWinControl; APrinter: TPrinter;
       const AParams: TPrintParams; DoPrint: Boolean): Integer; override;
+
+    class procedure Redo(const AWinControl: TWinControl); override;
+    class function GetCanRedo(const AWinControl: TWinControl): Boolean; override;
   end;
 
   { TWin32Inline }
@@ -531,7 +534,7 @@ begin
 end;
 
 class function TWin32WSCustomRichMemo.CanPasteFromClipboard(
-  const AWinControl: TWinControl): Boolean;
+  const AWinControl: TWinControl): boolean;
 begin
   Result:=Assigned(AWinControl) and (SendMessage(AWinControl.Handle, EM_CANPASTE, 0, 0)<>0);
 end;
@@ -1437,6 +1440,17 @@ begin
   end;
 end;
 
+class procedure TWin32WSCustomRichMemo.Redo(const AWinControl: TWinControl);
+begin
+  SendMessage( AWinControl.Handle, EM_REDO, 0, 0);
+end;
+
+class function TWin32WSCustomRichMemo.GetCanRedo(const AWinControl: TWinControl
+  ): Boolean;
+begin
+  Result:=SendMessage( AWinControl.Handle, EM_CANREDO, 0, 0)<>0;
+end;
+
 
 // The function doesn't use Windows 7 (Vista?) animations. And should.
 function ThemedNCPaint(AWindow: Windows.HANDLE; RichMemo: TCustomRichMemo; WParam: WParam; LParam: LParam; var Handled: Boolean): LResult;
diff --git a/components/richmemo/wsrichmemo.pas b/components/richmemo/wsrichmemo.pas
index a612bc837..00c727112 100644
--- a/components/richmemo/wsrichmemo.pas
+++ b/components/richmemo/wsrichmemo.pas
@@ -115,6 +115,9 @@ type
        AHandler: TRichMemoInline; wsObj: TRichMemoInlineWSObject); virtual;
 
     class function Print(const AWinControl: TWinControl; APrinter: TPrinter; const AParams: TPrintParams; DoPrint: Boolean): Integer; virtual;
+
+    class procedure Redo(const AWinControl: TWinControl); virtual;
+    class function GetCanRedo(const AWinControl: TWinControl): Boolean; virtual;
   end;
   TWSCustomRichMemoClass = class of TWSCustomRichMemo;
 
@@ -406,5 +409,16 @@ begin
   Result:=0;
 end;
 
+class procedure TWSCustomRichMemo.Redo(const AWinControl: TWinControl);
+begin
+
+end;
+
+class function TWSCustomRichMemo.GetCanRedo(const AWinControl: TWinControl
+  ): Boolean;
+begin
+  Result:=false;
+end;
+
 end.