1

我需要更改我的 delphi 表单控件的视觉样式，以便从 .Net 环境中显示它们。为此，我需要将 delphi 控件的颜色更改为蓝色（$00FCF5EE）。我广泛使用了没有“颜色”属性的“TButton”控件。因此，我没有将按钮更改为速度按钮，而是通过引入父表单并从该父表单继承所有其他表单来尝试不同的方法形式。在父窗体中，我有一个类助手来更改按钮的颜色。这是代码：（我使用的是Delphi 2007） 

TButtonHelper=class helper for TButton
private
  procedure doChangeColor;
public
  procedure DrawChangeColor;
end;

TParentForm = class(TForm)
public
  procedure AfterConstruction; override;
end;

在实施部分，我有

    procedure TButtonHelper.doChangeColor;
    var
      SaveIndex: Integer;
      FCanvas:TCanvas;
      rect:TRect;
    begin
      if csDestroying in ComponentState then exit;
      FCanvas:=TCanvas.Create;

        SaveIndex := SaveDC(Self.Handle);
        FCanvas.Lock;
        try
          FCanvas.Handle := Handle;
          FCanvas.Font := Font;
          FCanvas.Brush := self.Brush;
          FCanvas.Brush.Color:=$00FCF5EE;
          FCanvas.FillRect(BoundsRect);//Omitting the code to draw the text
        finally
          FCanvas.Handle := 0;
          FCanvas.Unlock;
          RestoreDC(handle, SaveIndex);
          FCanvas.Free;
        end;
    end;


    procedure TButtonHelper.DrawChangeColor;
    begin
        doChangeColor;
        self.Repaint;
    end;

procedure TParentForm.AfterConstruction;
    var
     i : Integer;
     wc: TControl;
    begin
      inherited;
      for i := 0 to self.ControlCount - 1 do begin
         wc:=Controls[i];
         if wc is  TButton then
            TButton(wc).DrawChangeColor;
      end;
    end;

但这不起作用。虽然执行了 doChangeColor 方法，但它并没有改变按钮的颜色。请让我知道我在这里缺少什么。

谢谢大家，

普拉迪普

4

1 回答 1

5

这是一个向标准 TButton 添加颜色属性的类：

unit u_class_colorbutton;

interface

uses
  Windows, Messages, SysUtils, Classes, Graphics, Controls, StdCtrls, Buttons, ExtCtrls;

type
  TColorButton = class(TButton)
  private
    ShowBackColor  : Boolean;
    FCanvas        : TCanvas;
    IsFocused      : Boolean;
    FBackColor     : TColor;
    FForeColor     : TColor;
    FHoverColor    : TColor;
    procedure SetBackColor(const Value: TColor);
    procedure SetForeColor(const Value: TColor);
    procedure SetHoverColor(const Value: TColor);
  protected
    procedure CreateParams(var Params: TCreateParams); override;
    procedure WndProc(var Message : TMessage); override;

    procedure SetButtonStyle(Value: Boolean); override;
    procedure DrawButton(Rect: TRect; State: UINT);

    procedure CMEnabledChanged(var Message: TMessage); message CM_ENABLEDCHANGED;
    procedure CMFontChanged(var Message: TMessage); message CM_FONTCHANGED;
    procedure CNMeasureItem(var Message: TWMMeasureItem); message CN_MEASUREITEM;
    procedure CNDrawItem(var Message: TWMDrawItem); message CN_DRAWITEM;
  public
    constructor Create(AOwner: TComponent); override;
    destructor Destroy; override;
  published
    property BackColor : TColor read FBackColor  write SetBackColor default clBtnFace;
    property ForeColor : TColor read FForeColor  write SetForeColor default clBtnText;
    property HoverColor: TColor read FHoverColor write SetHoverColor default clBtnFace;
  end;

procedure Register;

implementation

constructor TColorButton.Create(AOwner: TComponent);
begin
 inherited Create(AOwner);
 ShowBackColor := True;
 FCanvas := TCanvas.Create;
 BackColor := clBtnFace;
 ForeColor := clBtnText;
 HoverColor := clBtnFace;
end;

destructor TColorButton.Destroy;
begin
 FreeAndNil(FCanvas);
 inherited Destroy;
end;

procedure TColorButton.WndProc(var Message : TMessage);
begin
 if (Message.Msg = CM_MOUSELEAVE) then
  begin
   ShowBackColor := True;
   Invalidate;
  end;
 if (Message.Msg = CM_MOUSEENTER) then
  begin
   ShowBackColor := False;
   Invalidate;
  end;
 inherited;
end;

procedure TColorButton.CreateParams(var Params: TCreateParams);
begin
 inherited CreateParams(Params);
  with Params do
    Style := Style or BS_OWNERDRAW;
end;

procedure TColorButton.SetButtonStyle(Value: Boolean);
begin
 if Value <> IsFocused then
  begin
   IsFocused := Value;
   Invalidate;
  end;
end;

procedure TColorButton.CNMeasureItem(var Message: TWMMeasureItem);
begin
 with Message.MeasureItemStruct^ do
  begin
   itemWidth  := Width;
   itemHeight := Height;
  end;
end;

procedure TColorButton.CNDrawItem(var Message: TWMDrawItem);
var
  SaveIndex: Integer;
begin
 with Message.DrawItemStruct^ do
  begin
   SaveIndex := SaveDC(hDC);
   FCanvas.Lock;
   try
    FCanvas.Handle := hDC;
    FCanvas.Font   := Font;
    FCanvas.Brush  := Brush;
    DrawButton(rcItem, itemState);
   finally
    FCanvas.Handle := 0;
    FCanvas.Unlock;
    RestoreDC(hDC, SaveIndex);
   end;
 end;
 Message.Result := 1;
end;

procedure TColorButton.CMEnabledChanged(var Message: TMessage);
begin
 inherited;
 Invalidate;
end;

procedure TColorButton.CMFontChanged(var Message: TMessage);
begin
 inherited;
 Invalidate;
end;

procedure TColorButton.SetBackColor(const Value: TColor);
begin
 if FBackColor <> Value then
  begin
   FBackColor:= Value;
   Invalidate;
  end;
end;

procedure TColorButton.SetForeColor(const Value: TColor);
begin
 if FForeColor <> Value then
  begin
   FForeColor:= Value;
   Invalidate;
  end;
end;

procedure TColorButton.SetHoverColor(const Value: TColor);
begin
 if FHoverColor <> Value then
  begin
   FHoverColor:= Value;
   Invalidate;
  end;
end;

procedure TColorButton.DrawButton(Rect: TRect; State: UINT);

var Flags, OldMode: Longint;
    IsDown, IsDefault, IsDisabled: Boolean;
    OldColor: TColor;
    OrgRect: TRect;
    NewCaption : string;

begin
 NewCaption := Caption;
 OrgRect := Rect;
 Flags := DFCS_BUTTONPUSH or DFCS_ADJUSTRECT;
 IsDown := State and ODS_SELECTED <> 0;
 IsDisabled := State and ODS_DISABLED <> 0;
 IsDefault := State and ODS_FOCUS <> 0;

 if IsDown then Flags := Flags or DFCS_PUSHED;
 if IsDisabled then Flags := Flags or DFCS_INACTIVE;

 if (IsFocused or IsDefault) then
  begin
   FCanvas.Pen.Color   := clWindowFrame;
   FCanvas.Pen.Width   := 1;
   FCanvas.Brush.Style := bsClear;
   FCanvas.Rectangle(Rect.Left, Rect.Top, Rect.Right, Rect.Bottom);
   InflateRect(Rect, - 1, - 1);
  end;

  if IsDown then
  begin
   FCanvas.Pen.Color   := clBtnShadow;
   FCanvas.Pen.Width   := 1;
   FCanvas.Brush.Color := clBtnFace;
   FCanvas.Rectangle(Rect.Left, Rect.Top, Rect.Right, Rect.Bottom);
   InflateRect(Rect, - 1, - 1);
  end
 else
  begin
   DrawFrameControl(FCanvas.Handle, Rect, DFC_BUTTON, Flags);
  end;

  if IsDown then OffsetRect(Rect, 1, 1);

  OldColor := FCanvas.Brush.Color;
  if ShowBackColor then
   FCanvas.Brush.Color := BackColor
  else
   FCanvas.Brush.Color := HoverColor;
  FCanvas.FillRect(Rect);
  FCanvas.Brush.Color := OldColor;
  OldMode := SetBkMode(FCanvas.Handle, TRANSPARENT);
  FCanvas.Font.Color := ForeColor;
  if IsDisabled then
   DrawState(FCanvas.Handle, FCanvas.Brush.Handle, nil, Integer(NewCaption), 0,
             ((Rect.Right - Rect.Left) - FCanvas.TextWidth(NewCaption)) div 2,
             ((Rect.Bottom - Rect.Top) - FCanvas.TextHeight(NewCaption)) div 2,
             0, 0, DST_TEXT or DSS_DISABLED)
  else
   begin
    InflateRect(Rect, -4, -4);
    DrawText(FCanvas.Handle, PChar(NewCaption), - 1, Rect, DT_WORDBREAK or DT_CENTER);
   end;

  SetBkMode(FCanvas.Handle, OldMode);

 if (IsFocused and IsDefault) then
  begin
   Rect := OrgRect;
   InflateRect(Rect, - 4, - 4);
   FCanvas.Pen.Color   := clWindowFrame;
   FCanvas.Brush.Color := clBtnFace;
   DrawFocusRect(FCanvas.Handle, Rect);
  end;
end;

procedure Register;
begin
  RegisterComponents('Standard', [TColorButton]);
end;

initialization
  RegisterClass(TColorButton); // needed for persistence at runtime


end.

您可以轻松地将其破解到您的应用程序中：在 .pas 和 .dfm 文件中查找/替换对 TColorButton 的所有 TButton 引用。您可以为背景、字体和悬停设置单独的颜色。

如果您想在应用程序范围内添加样式，也许最好使用具有本地支持的库（如 DevExpress、TMS 等）创建一个 GUI……就我个人而言，我最喜欢 DevExpress，但这是个人品味的问题。

于 2012-05-10T08:07:25.633 回答