標準の TButton にカラー プロパティを追加するクラスを次に示します。
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.
アプリケーションに簡単にハッキングできます。.pas および .dfm ファイル内の TColorButton へのすべての TButton 参照を検索/置換します。背景、フォント、ホバリングに個別の色を設定できます。
スタイリング アプリケーション全体を追加する場合は、DevExpress や TMS などのネイティブ サポートを備えたライブラリを使用して GUI を作成する方がよいかもしれません。個人的には、DevExpress が一番好きですが、それは個人的な好みの問題です。