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启用Delphi VCL样式后如何使工具栏按钮变平？

delphivcl-styles
5
如果没有启用VCL样式，我的TActionToolbar(s)看起来像是扁平的工具栏。但是，如果我启用了几乎任何VCL样式，突然间所有工具栏按钮都会变成3D按钮。
VCL样式查看器应用程序显示工具栏按钮具有平面和按钮式外观：
如何使我的TActionToolbar具有扁平的工具栏按钮样式，而不是启用VCL样式时看起来像一堆按钮？
1个回答
11
所有与TActionManager相关的控件所使用的绘制方法都由TPlatformDefaultStyleActionBars类处理，然后根据Windows版本、是否启用VCL样式等选择用于绘制控件的类。在这种情况下，选择了csThemedTActionControlStyle，并使用Vcl.ThemedActnCtrls单元中定义的类。
因此，要修改按钮的外观，您需要创建一个TActionBarStyleEx派生类，然后覆盖Vcl.ThemedActnCtrls单元中定义的类和方法。幸运的是，这项工作已经在Vcl.PlatformVclStylesActnCtrls单元中完成，该单元是Vcl Styles Utils项目的一部分。因此，您只需要进行一些小的修改即可获得所需的结果。
尝试此示例（这是Vcl.PlatformVclStylesActnCtrls单元的修改版本），我添加了一些注释以显示必须修改代码的位置。
unit Vcl.PlatformVclStylesActnCtrls;

interface

uses
   Vcl.ActnMan,
   Vcl.Buttons,
   Vcl.PlatformDefaultStyleActnCtrls;

type
  TPlatformVclStylesStyle = class(TPlatformDefaultStyleActionBars)
  public
    function GetControlClass(ActionBar: TCustomActionBar; AnItem: TActionClientItem): TCustomActionControlClass; override;
    function GetStyleName: string; override;
  end;

var
  PlatformVclStylesStyle: TPlatformVclStylesStyle;

implementation

uses
  Vcl.Menus,
  Winapi.Windows,
  System.SysUtils,
  Vcl.ActnMenus,
  Vcl.ActnCtrls,
  Vcl.ThemedActnCtrls,
  Vcl.Forms,
  Vcl.ListActns,
  Vcl.ActnColorMaps,
  Vcl.Themes,
  Vcl.XPActnCtrls,
  Vcl.StdActnMenus,
  Vcl.Graphics;

type
  TActionControlStyle = (csStandard, csXPStyle, csThemed);

  TThemedMenuItemEx = class(Vcl.ThemedActnCtrls.TThemedMenuItem)
  private
    procedure NativeDrawText(DC: HDC; const Text: string; var Rect: TRect; Flags: Longint);
  protected
    procedure DrawText(var Rect: TRect; var Flags: Cardinal; Text: string); override;
  end;

  TThemedMenuButtonEx = class(Vcl.ThemedActnCtrls.TThemedMenuButton)
  private
    procedure NativeDrawText(const Text: string; var Rect: TRect; Flags: Longint);
  protected
    procedure DrawText(var ARect: TRect; var Flags: Cardinal;
      Text: string); override;
  end;

  TThemedMenuItemHelper = class Helper for TThemedMenuItem
  private
   function GetPaintRect: TRect;
   property PaintRect: TRect read GetPaintRect;
  end;

  TThemedButtonControlEx = class(TThemedButtonControl)
  protected
    procedure DrawBackground(var PaintRect: TRect); override;
  end;


{ TThemedMenuItemHelper }
function TThemedMenuItemHelper.GetPaintRect: TRect;
begin
 Result:=Self.FPaintRect;
end;

function GetActionControlStyle: TActionControlStyle;
begin
  if TStyleManager.IsCustomStyleActive then
    Result := csThemed
  else
  if TOSVersion.Check(6) then
  begin
    if StyleServices.Theme[teMenu] <> 0 then
      Result := csThemed
    else
      Result := csXPStyle;
  end
  else
  if TOSVersion.Check(5, 1) then
    Result := csXPStyle
  else
    Result := csStandard;
end;

{ TPlatformDefaultStyleActionBarsStyle }

function TPlatformVclStylesStyle.GetControlClass(ActionBar: TCustomActionBar;
  AnItem: TActionClientItem): TCustomActionControlClass;
begin
  if ActionBar is TCustomActionToolBar then
  begin
    if AnItem.HasItems then
      case GetActionControlStyle of
        csStandard: Result := TStandardDropDownButton;
        csXPStyle: Result := TXPStyleDropDownBtn;
      else
        Result := TThemedDropDownButton;
      end
    else
    if (AnItem.Action is TStaticListAction) or (AnItem.Action is TVirtualListAction) then
      Result := TCustomComboControl
    else
    case GetActionControlStyle of
      csStandard: Result := TStandardButtonControl;
      csXPStyle: Result := TXPStyleButton;
    else
      Result := TThemedButtonControlEx;//this is the class used to draw the buttons of the TActionToolbar
    end
  end
  else
  if ActionBar is TCustomActionMainMenuBar then
    case GetActionControlStyle of
      csStandard: Result := TStandardMenuButton;
      csXPStyle: Result := TXPStyleMenuButton;
    else
      Result := TThemedMenuButtonEx;
    end
  else
  if ActionBar is TCustomizeActionToolBar then
  begin
    with TCustomizeActionToolbar(ActionBar) do
      if not Assigned(RootMenu) or (AnItem.ParentItem <> TCustomizeActionToolBar(RootMenu).AdditionalItem) then
        case GetActionControlStyle of
          csStandard: Result := TStandardMenuItem;
          csXPStyle: Result := TXPStyleMenuItem;
        else
          Result := TThemedMenuItemEx;
        end
      else
      case GetActionControlStyle of
          csStandard: Result := TStandardAddRemoveItem;
          csXPStyle: Result := TXPStyleAddRemoveItem;
      else
          Result := TThemedAddRemoveItem;
      end
  end
  else
  if ActionBar is TCustomActionPopupMenu then
    case GetActionControlStyle of
      csStandard: Result := TStandardMenuItem;
      csXPStyle: Result := TXPStyleMenuItem;
    else
      Result := TThemedMenuItemEx;
    end
  else
  case GetActionControlStyle of
    csStandard: Result := TStandardButtonControl;
    csXPStyle: Result := TXPStyleButton;
  else
    Result := TThemedButtonControl;
  end
end;

function TPlatformVclStylesStyle.GetStyleName: string;
begin
  Result := 'Platform VclStyles Style';
end;

{ TThemedMenuItemEx }

procedure TThemedMenuItemEx.NativeDrawText(DC: HDC; const Text: string;
  var Rect: TRect; Flags: Integer);
const
  MenuStates: array[Boolean] of TThemedMenu = (tmPopupItemDisabled, tmPopupItemNormal);
var
  LCaption: string;
  LFormats: TTextFormat;
  LColor: TColor;
  LDetails: TThemedElementDetails;
  LNativeStyle : TCustomStyleServices;
begin
  LNativeStyle:=TStyleManager.SystemStyle;

  LFormats := TTextFormatFlags(Flags);
  if Selected and Enabled then
  begin
    LDetails := StyleServices.GetElementDetails(tmPopupItemHot);
    if TOSVersion.Check(5, 1) then
     SetBkMode(DC, Winapi.Windows.TRANSPARENT);
  end
  else
    LDetails := StyleServices.GetElementDetails(MenuStates[Enabled or ActionBar.DesignMode]);

  if not StyleServices.GetElementColor(LDetails, ecTextColor, LColor) or (LColor = clNone) then
    LColor := ActionBar.ColorMap.FontColor;

  LCaption := Text;
  if (tfCalcRect in LFormats) and ( (LCaption = '') or (LCaption[1] = cHotkeyPrefix) and (LCaption[2] = #0) ) then
    LCaption := LCaption + ' ';

  LNativeStyle.DrawText(DC, LDetails, LCaption, Rect, LFormats, LColor);
end;

procedure TThemedMenuItemEx.DrawText(var Rect: TRect; var Flags: Cardinal;
  Text: string);
var
  LRect: TRect;
begin
  if Selected and Enabled then
    StyleServices.DrawElement(Canvas.Handle, StyleServices.GetElementDetails(tmPopupItemHot), PaintRect)
  else if Selected then
    StyleServices.DrawElement(Canvas.Handle, StyleServices.GetElementDetails(tmPopupItemDisabledHot), PaintRect);

  if (Parent is TCustomActionBar) and (not ActionBar.PersistentHotkeys) then
    Text := FNoPrefix;
  Canvas.Font := Screen.MenuFont;

  if ActionClient.Default then
    Canvas.Font.Style := Canvas.Font.Style + [fsBold];

  LRect := PaintRect;
  NativeDrawText(Canvas.Handle, Text, LRect, Flags or DT_CALCRECT or DT_NOCLIP);
  OffsetRect(LRect, Rect.Left,
    ((PaintRect.Bottom - PaintRect.Top) - (LRect.Bottom - LRect.Top)) div 2);
  NativeDrawText(Canvas.Handle, Text, LRect, Flags);

  if ShowShortCut and ((ActionClient <> nil) and not ActionClient.HasItems) then
  begin
    Flags := DrawTextBiDiModeFlags(DT_RIGHT);
    LRect := TRect.Create(ShortCutBounds.Left, LRect.Top, ShortCutBounds.Right, LRect.Bottom);
    LRect.Offset(Width, 0);
    NativeDrawText(Canvas.Handle, ActionClient.ShortCutText, LRect, Flags);
  end;
end;

{ TThemedMenuButtonEx }
procedure TThemedMenuButtonEx.NativeDrawText(const Text: string; var Rect: TRect;
  Flags: Integer);
const
  MenuStates: array[Boolean] of TThemedMenu = (tmMenuBarItemNormal, tmMenuBarItemHot);
var
  LCaption: string;
  LFormats: TTextFormat;
  LColor: TColor;
  LDetails: TThemedElementDetails;
  LNativeStyle : TCustomStyleServices;
begin
  LNativeStyle:=TStyleManager.SystemStyle;

  LFormats := TTextFormatFlags(Flags);
  if Enabled then
    LDetails := StyleServices.GetElementDetails(MenuStates[Selected or MouseInControl or ActionBar.DesignMode])
  else
    LDetails := StyleServices.GetElementDetails(tmMenuBarItemDisabled);

  Canvas.Brush.Style := bsClear;
  if Selected then
    Canvas.Font.Color := clHighlightText
  else
    Canvas.Font.Color := clMenuText;

  if not StyleServices.GetElementColor(LDetails, ecTextColor, LColor) or (LColor = clNone) then
    LColor := ActionBar.ColorMap.FontColor;

  LCaption := Text;
  if (tfCalcRect in LFormats) and ( (LCaption = '') or (LCaption[1] = cHotkeyPrefix) and (LCaption[2] = #0) ) then
    LCaption := LCaption + ' ';

  if Enabled then
    LDetails := StyleServices.GetElementDetails(MenuStates[Selected or MouseInControl]);

  LNativeStyle.DrawText(Canvas.Handle, LDetails, LCaption, Rect, LFormats, LColor);
end;

procedure TThemedMenuButtonEx.DrawText(var ARect: TRect; var Flags: Cardinal;
  Text: string);
var
  LRect: TRect;
begin
  if Parent is TCustomActionMainMenuBar then
    if not TCustomActionMainMenuBar(Parent).PersistentHotkeys then
      Text := StripHotkey(Text);

  LRect := ARect;
  Inc(LRect.Left);
  Canvas.Font := Screen.MenuFont;
  NativeDrawText(Text, LRect, Flags or DT_CALCRECT or DT_NOCLIP);
  NativeDrawText(Text, LRect, Flags);
end;

{ TThemedButtonControlEx }
//Here you must modify the code to draw the buttons
procedure TThemedButtonControlEx.DrawBackground(var PaintRect: TRect);
const
  DisabledState: array[Boolean] of TThemedToolBar = (ttbButtonDisabled, ttbButtonPressed);
  CheckedState: array[Boolean] of TThemedToolBar = (ttbButtonHot, ttbButtonCheckedHot);
var
  SaveIndex: Integer;
begin
  if not StyleServices.IsSystemStyle and ActionClient.Separator then Exit;

  SaveIndex := SaveDC(Canvas.Handle);
  try
    if Enabled and not (ActionBar.DesignMode) then
    begin
      if (MouseInControl or IsChecked) and
         Assigned(ActionClient) {and not ActionClient.Separator)} then
      begin
        StyleServices.DrawElement(Canvas.Handle, StyleServices.GetElementDetails(CheckedState[IsChecked or (FState = bsDown)]), PaintRect);

        if not MouseInControl then
          StyleServices.DrawElement(Canvas.Handle, StyleServices.GetElementDetails(ttbButtonPressed), PaintRect);
      end
      else
        ;//StyleServices.DrawElement(Canvas.Handle, StyleServices.GetElementDetails(ttbButtonNormal), PaintRect);// the code to draw the button in normal state was commented to get the desired look and feel
    end
    else
      ;//StyleServices.DrawElement(Canvas.Handle, StyleServices.GetElementDetails(DisabledState[IsChecked]), PaintRect);// the code to draw the button in disabled state was commented to get the desired look and feel

  finally
    RestoreDC(Canvas.Handle, SaveIndex);
  end;
end;

initialization
  PlatformVclStylesStyle := TPlatformVclStylesStyle.Create;
  RegisterActnBarStyle(PlatformVclStylesStyle);
  DefaultActnBarStyle :=PlatformVclStylesStyle.GetStyleName;
finalization
  UnregisterActnBarStyle(PlatformVclStylesStyle);
  PlatformVclStylesStyle.Free;
end.

要使用它，只需将 Vcl.PlatformVclStylesActnCtrls 单元添加到您的项目中，然后像这样设置您的 TActionManager 的 Style：

  ActionManager1.Style:=PlatformVclStylesStyle;

改变前

输入图像描述

改变后

输入图像描述

谢谢，这对于所有常规按钮都很有效。有一个工具栏按钮，它有一个包含其他项目的子菜单，但仍然显示为带边框的按钮。使具有子菜单的按钮也变平会很困难吗？ - Jessica Brown
在这种情况下，您必须使用TThemedMenuButtonEx类并覆盖DrawBackground方法。 - RRUZ
我只有XE4的入门版，其中不包括VCL源代码。我猜想DrawBackground的内容来自VCL源代码？它绝对不在Vcl.PlatformVclStylesActnCtrls源代码中;-) - Jessica Brown
@JessicaBrown，请发送一封电子邮件到rodrigo点ruz点v在gmail点com，附带一个样例项目，或者在SO上发布一个新问题。 - RRUZ
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