Delphi：使用类帮助器更改按钮颜色 [英] Delphi: Changing the Button Color using a Class Helper
问题描述
我需要更改我的delphi表单控件的视觉样式，以便在.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）。我广泛使用了不具有 Color属性的 TButton控件。因此，我没有将按钮更改为快速按钮，而是尝试了另一种方法，即引入父窗体并从该父窗体继承所有其他窗体形成。在父窗体中，我有一个类助手来更改按钮的颜色。下面是代码：（我正在使用Delphi 2007）
I need to change the visual style of my delphi form controls inorder to show them from a .Net environment. To do this, I need to change the colors of delphi controls to blue ($00FCF5EE). I have used "TButton" controls widely which doesn't have a "Color" property.So, instead of changing the buttons to speed buttons, I have tried a different approach by introducing a parent form and inheriting all the other forms from this parent form. In the parent form, I have a class helper to change the color of buttons. Here is the code: (I am using 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;
但这是行不通的。尽管doChangeColor方法已执行，但它不会更改按钮的颜色。请让我知道我在这里缺少的内容。
But this doesn't work. Although the doChangeColor method is executed, it is not changing the color of the button.Please let me know what I am missing here.
谢谢大家，
Pradeep
推荐答案
这是一个将颜色属性添加到标准TButton的类： / p>
here's a class that adds color properties to the standard TButton:
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.
您可以轻松地将其入侵到应用程序中：
查找/替换所有TButton对TColorButton的引用$ .bs和.dfm文件中的
。
您可以为背景，字体和悬停设置单独的颜色。
You can hack it into your application easily: find/replace all TButton references to TColorButton inside your .pas and .dfm files. You can set separate colors for background, font and hovering.
如果要在整个范围内添加样式应用程序，也许最好创建带有库的GUI拥有DevExpress，TMS等本地支持...
就个人而言，我最喜欢DevExpress，但这是个人喜好的问题。
If you want add styling application wide, maybe it is better to create a GUI with a library that has native support like DevExpress, TMS, ... Personally, I like DevExpress the most but that's a matter of personal taste.
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