Merge pull request #1225 from livius2/systemImages_theme

CreateSystemImageSet, SetWindowTheme and small cleanup

Author: joachimmarder

Source/VirtualTrees.BaseAncestorFMX.pas

@@ -60,6 +60,8 @@   TVTBaseAncestorFMX = class abstract(TRectangle)
     procedure DragCanceled; virtual; abstract;
 
     procedure Resize; override;
+	function CreateSystemImageSet(): TImageList;
+	procedure SetWindowTheme(const Theme: string); virtual;
 
     procedure ChangeScale(M, D: Integer{$if CompilerVersion >= 31}; isDpiChange: Boolean{$ifend}); virtual; abstract;
     function GetControlsAlignment: TAlignment; virtual; abstract;
@@ -68,7 +70,7 @@   TVTBaseAncestorFMX = class abstract(TRectangle)
     procedure MarkCutCopyNodes; virtual; abstract;
     function GetSortedCutCopySet(Resolve: Boolean): TNodeArray; virtual; abstract;
     function GetSortedSelection(Resolve: Boolean): TNodeArray; virtual; abstract;
-    procedure WriteNode(Stream: TStream; Node: PVirtualNode);  virtual; abstract;  
+    procedure WriteNode(Stream: TStream; Node: PVirtualNode);  virtual; abstract;
   protected //properties
     property DottedBrushTreeLines: TStrokeBrush read FDottedBrushTreeLines write FDottedBrushTreeLines;
     property DottedBrushGridLines: TStrokeBrush read FDottedBrushGridLines write FDottedBrushGridLines;
@@ -606,4 +608,19 @@ function TVTBaseAncestorFMX.GetSystemMetrics(nIndex: Integer): Integer;
   {$ENDIF}
 end;
 
+//----------------------------------------------------------------------------------------------------------------------
+
+function TVTBaseAncestorFMX.CreateSystemImageSet(): TImageList;
+begin
+  Result:= TImageList.Create(Self);
+  FillSystemCheckImages(Self, Result);
+end;
+
+//----------------------------------------------------------------------------------------------------------------------
+
+procedure TVTBaseAncestorFMX.SetWindowTheme(const Theme: string);
+begin
+  //nothing
+end;
+
 end.

Source/VirtualTrees.BaseAncestorVcl.pas

@@ -37,6 +37,8 @@   TVTBaseAncestorVcl = class abstract(TCustomControl)
     function RenderOLEData(const FormatEtcIn: TFormatEtc; out Medium: TStgMedium; ForClipboard: Boolean): HResult; virtual;
     procedure NotifyAccessibleEvent(pEvent: DWord = EVENT_OBJECT_STATECHANGE);
     function PrepareDottedBrush(CurrentDottedBrush: TBrush; Bits: Pointer; const BitsLinesCount: Word): TBrush; virtual;
+    function CreateSystemImageSet(): TImageList;
+    procedure SetWindowTheme(const Theme: string); virtual;
     //// Abtract method that are implemented in TBaseVirtualTree, keep in sync with TVTBaseAncestorFMX
     function GetSelectedCount(): Integer; virtual; abstract;
     procedure MarkCutCopyNodes; virtual; abstract;
@@ -104,10 +106,17 @@ implementation
 
 uses
   System.SyncObjs,
+  System.SysUtils,
   Vcl.AxCtrls,
+  Vcl.Forms,
+  Vcl.Themes,
+  Winapi.CommCtrl,
+  Winapi.ShlObj,
+  Winapi.UxTheme,
   VirtualTrees.DataObject,
   VirtualTrees.Clipboard,
-  VirtualTrees.AccessibilityFactory;
+  VirtualTrees.AccessibilityFactory,
+  VirtualTrees.StyleHooks;
 
 //----------------------------------------------------------------------------------------------------------------------
 
@@ -283,6 +292,137 @@ procedure TVTBaseAncestorVcl.CopyToClipboard;
   end;
 end;
 
+function TVTBaseAncestorVcl.CreateSystemImageSet: TImageList;
+
+// Creates a system check image set.
+// Note: the DarkCheckImages and FlatImages image lists must already be filled, as some images from them are copied here.
+
+const
+  MaskColor: TColor = clRed;
+  cFlags = ILC_COLOR32 or ILC_MASK;
+
+var
+  BM: TBitmap;
+  Theme: HTHEME;
+  Details: TThemedElementDetails;
+
+  //---------------------------------------------------------------------------
+
+  // Mitigator function to use the correct style service for this context (either the style assigned to the control for Delphi > 10.4 or the application style)
+  function StyleServices: TCustomStyleServices;
+  begin
+    Result := VTStyleServices(Self);
+  end;
+
+  procedure AddSystemImage(IL: TImageList; Index: Integer);
+  const
+    States: array [0..19] of Integer = (
+      RBS_UNCHECKEDNORMAL, RBS_UNCHECKEDHOT, RBS_UNCHECKEDPRESSED, RBS_UNCHECKEDDISABLED,
+      RBS_CHECKEDNORMAL, RBS_CHECKEDHOT, RBS_CHECKEDPRESSED, RBS_CHECKEDDISABLED,
+      CBS_UNCHECKEDNORMAL, CBS_UNCHECKEDHOT, CBS_UNCHECKEDPRESSED, CBS_UNCHECKEDDISABLED,
+      CBS_CHECKEDNORMAL, CBS_CHECKEDHOT, CBS_CHECKEDPRESSED, CBS_CHECKEDDISABLED,
+      CBS_MIXEDNORMAL, CBS_MIXEDHOT, CBS_MIXEDPRESSED, CBS_MIXEDDISABLED);
+  var
+    ButtonState: Cardinal;
+    ButtonType: Cardinal;
+
+  begin
+    BM.Canvas.FillRect(Rect(0, 0, BM.Width, BM.Height));
+    if StyleServices.Enabled and StyleServices.IsSystemStyle then
+    begin
+      if Index < 8 then
+        Details.Part := BP_RADIOBUTTON
+      else
+        Details.Part := BP_CHECKBOX;
+      Details.State := States[Index];
+      DrawThemeBackground(Theme, BM.Canvas.Handle, Details.Part, Details.State, Rect(0, 0, BM.Width, BM.Height), nil);
+    end
+    else
+    begin
+      if Index < 8 then
+        ButtonType := DFCS_BUTTONRADIO
+      else
+        ButtonType := DFCS_BUTTONCHECK;
+      if Index >= 16 then
+        ButtonType := ButtonType or DFCS_BUTTON3STATE;
+
+      case Index mod 4 of
+        0:
+          ButtonState := 0;
+        1:
+          ButtonState := DFCS_HOT;
+        2:
+          ButtonState := DFCS_PUSHED;
+        else
+          ButtonState := DFCS_INACTIVE;
+      end;
+      if Index in [4..7, 12..19] then
+        ButtonState := ButtonState or DFCS_CHECKED;
+//      if Flat then
+//        ButtonState := ButtonState or DFCS_FLAT;
+      DrawFrameControl(BM.Canvas.Handle, Rect(0, 0, BM.Width, BM.Height), DFC_BUTTON, ButtonType or ButtonState);
+    end;
+    IL.AddMasked(BM, MaskColor);
+  end;
+
+  //--------------- end local functions ---------------------------------------
+
+const
+  cDefaultCheckboxSize = 13;// Used when no other value is available
+var
+  I: Integer;
+  lSize: TSize;
+  Res: Boolean;
+begin
+  BM := TBitmap.Create; // Create a temporary bitmap, which holds the intermediate images.
+  try
+    Res := False;
+    // Retrieve the checkbox image size, prefer theme if available, fall back to GetSystemMetrics() otherwise, but this returns odd results on Windows 8 and higher in high-dpi scenarios.
+    if StyleServices.Enabled then
+      if StyleServices.IsSystemStyle then
+      begin
+        {$if CompilerVersion >= 33}
+        if TOSVersion.Check(10) and (TOSVersion.Build >= 15063)  then
+          Theme := OpenThemeDataForDPI(Handle, 'BUTTON', CurrentPPI)
+        else
+        {$ifend}
+          Theme := OpenThemeData(Self.Handle, 'BUTTON');
+        Details := StyleServices.GetElementDetails(tbCheckBoxUncheckedNormal);
+        Res := GetThemePartSize(Theme, BM.Canvas.Handle, Details.Part, Details.State, nil, TS_TRUE, lSize) = S_OK;
+      end
+      else
+        Res := StyleServices.GetElementSize(BM.Canvas.Handle, StyleServices.GetElementDetails(tbCheckBoxUncheckedNormal), TElementSize.esActual, lSize {$IF CompilerVersion >= 34}, Self.CurrentPPI{$IFEND});
+    if not Res then begin
+      lSize := TSize.Create(GetSystemMetrics(SM_CXMENUCHECK), GetSystemMetrics(SM_CYMENUCHECK));
+      if lSize.cx = 0 then begin // error? (Should happen rarely only)
+        lSize.cx := MulDiv(cDefaultCheckboxSize, Screen.PixelsPerInch, USER_DEFAULT_SCREEN_DPI);
+        lSize.cy := lSize.cx;
+      end;// if
+    end;//if
+
+    Result := TImageList.CreateSize(lSize.cx, lSize.cy);
+    Result.Handle := ImageList_Create(Result.Width, Result.Height, cFlags, 0, Result.AllocBy);
+    Result.Masked := True;
+    Result.BkColor := clWhite;
+
+    // Make the bitmap the same size as the image list is to avoid problems when adding.
+    BM.SetSize(Result.Width, Result.Height);
+    BM.Canvas.Brush.Color := MaskColor;
+    BM.Canvas.Brush.Style := bsSolid;
+    BM.Canvas.FillRect(Rect(0, 0, BM.Width, BM.Height));
+    Result.AddMasked(BM, MaskColor);
+
+    // Add the 20 system checkbox and radiobutton images.
+    for I := 0 to 19 do
+      AddSystemImage(Result, I);
+    if StyleServices.Enabled and StyleServices.IsSystemStyle then
+      CloseThemeData(Theme);
+
+  finally
+    BM.Free;
+  end;
+end;
+
 procedure TVTBaseAncestorVcl.CutToClipboard;
 var
   lDataObject: IDataObject;
@@ -409,6 +549,13 @@ function TVTBaseAncestorVcl.SetScrollInfo(Bar: Integer; const ScrollInfo: TScrol
 
 //----------------------------------------------------------------------------------------------------------------------
 
+procedure TVTBaseAncestorVcl.SetWindowTheme(const Theme: string);
+begin
+  Winapi.UxTheme.SetWindowTheme(Handle, PWideChar(Theme), nil);
+end;
+
+//----------------------------------------------------------------------------------------------------------------------
+
 function TVTBaseAncestorVcl.GetScrollInfo(Bar: Integer; var ScrollInfo: TScrollInfo): Boolean;
 begin
   Result:= WinApi.Windows.GetScrollInfo(Handle, Bar, ScrollInfo);