本文介绍了如何启用VCL样式来更改TPanel的颜色?的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
当启用VCL样式时,我需要更改TPanel的颜色。我尝试使用和修改文章中列出的代码 ,但它不适用于TPanel。如何启用VCL样式来更改TPanel的颜色?
I need to change the color of a TPanel when the VCL styles are enabled. I tried using and modifying the code listed in the article Changing the color of Edit Controls with VCL Styles Enabled, but it is not working for a TPanel. How I can change the color of a TPanel with the VCL Styles enabled?
推荐答案
不使用样式钩子绘制控件,所以你不能使用文章中描述的技术。相反,您必须覆盖方法。
使用插入程序类检查此示例。
Check this sample using a interposer class.
type
TPanel=Class(Vcl.ExtCtrls.TPanel)
protected
procedure Paint; override;
End;
Uses
Vcl.Styles,
Vcl.Themes;
{$R *.dfm}
{ TPanel }
procedure TPanel.Paint;
const
Alignments: array[TAlignment] of Longint = (DT_LEFT, DT_RIGHT, DT_CENTER);
VerticalAlignments: array[TVerticalAlignment] of Longint = (DT_TOP, DT_BOTTOM, DT_VCENTER);
var
Rect: TRect;
LColor: TColor;
LStyle: TCustomStyleServices;
LDetails: TThemedElementDetails;
TopColor : TColor;
BottomColor : TColor;
LBaseColor : TColor;
LBaseTopColor : TColor;
LBaseBottomColor: TColor;
Flags: Longint;
procedure AdjustColors(Bevel: TPanelBevel);
begin
TopColor := LBaseTopColor;
if Bevel = bvLowered then
TopColor := LBaseBottomColor;
BottomColor := LBaseBottomColor;
if Bevel = bvLowered then
BottomColor := LBaseTopColor;
end;
begin
Rect := GetClientRect;
LBaseColor := Color;//use the color property value to get the background color.
LBaseTopColor := clBtnHighlight;
LBaseBottomColor := clBtnShadow;
LStyle := StyleServices;
if LStyle.Enabled then
begin
LDetails := LStyle.GetElementDetails(tpPanelBevel);
if LStyle.GetElementColor(LDetails, ecEdgeHighLightColor, LColor) and (LColor <> clNone) then
LBaseTopColor := LColor;
if LStyle.GetElementColor(LDetails, ecEdgeShadowColor, LColor) and (LColor <> clNone) then
LBaseBottomColor := LColor;
end;
if BevelOuter <> bvNone then
begin
AdjustColors(BevelOuter);
Frame3D(Canvas, Rect, TopColor, BottomColor, BevelWidth);
end;
if not (LStyle.Enabled and (csParentBackground in ControlStyle)) then
Frame3D(Canvas, Rect, LBaseColor, LBaseColor, BorderWidth)
else
InflateRect(Rect, -Integer(BorderWidth), -Integer(BorderWidth));
if BevelInner <> bvNone then
begin
AdjustColors(BevelInner);
Frame3D(Canvas, Rect, TopColor, BottomColor, BevelWidth);
end;
with Canvas do
begin
if not LStyle.Enabled or not ParentBackground then
begin
Brush.Color := LBaseColor;
FillRect(Rect);
end;
if ShowCaption and (Caption <> '') then
begin
Brush.Style := bsClear;
Font := Self.Font;
Flags := DT_EXPANDTABS or DT_SINGLELINE or
VerticalAlignments[VerticalAlignment] or Alignments[Alignment];
Flags := DrawTextBiDiModeFlags(Flags);
if LStyle.Enabled then
begin
LDetails := LStyle.GetElementDetails(tpPanelBackground);
if not LStyle.GetElementColor(LDetails, ecTextColor, LColor) or (LColor = clNone) then
LColor := Font.Color;
LStyle.DrawText(Handle, LDetails, Caption, Rect, TTextFormatFlags(Flags), LColor)
end
else
DrawText(Handle, Caption, -1, Rect, Flags);
end;
end;
end;
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