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delphi queryCommandState

2024-07-15 08:09:05   222人阅读

 

如何 获取当前光标所在的字符属性

 

关键点

function queryCommandState(const cmdID: WideString): WordBool; safecall;

  1. 粗体
  2. 斜体
  3. 下划线
  4. 删除线
  5. 对齐方式 左 中 右
  6. 数字排序
  7. 圆的排序
  8. 上标
  9. 下标

 

function queryCommandValue(const cmdID: WideString): OleVariant; safecall;

  1. 字体名称
  2. 字符大小

 

实现过程

 

 
function GetFontName():string;
begin
      Result:=(Form1.webbrowser1.Document as IHTMLDocument2).queryCommandValue(‘FontName‘);
end;
 
function GetFontSize():string;
begin
    Result:=(Form1.webbrowser1.Document as IHTMLDocument2).queryCommandValue(‘FontSize‘);
end;
 
function IsBold():Boolean;
Var  bRtn:Boolean;
begin
    bRtn:= (Form1.webbrowser1.Document as IHTMLDocument2).queryCommandState(‘Bold‘);
    if bRtn then
        Result:=True
    else
        Result:=False;
end;
 
function IsItalic():Boolean;
Var  bRtn:Boolean;
begin
    bRtn:= (Form1.webbrowser1.Document as IHTMLDocument2).queryCommandState(‘Italic‘);
    if bRtn then
        Result:=True
    else
        Result:=False;
end;
 
function IsUnderline():Boolean;
Var  bRtn:Boolean;
begin
    bRtn:= (Form1.webbrowser1.Document as IHTMLDocument2).queryCommandState(‘Underline‘);
    if bRtn then
        Result:=True
    else
        Result:=False;
end;
 
function IsStrikeThrough():Boolean;
Var  bRtn:Boolean;
begin
    bRtn:= (Form1.webbrowser1.Document as IHTMLDocument2).queryCommandState(‘StrikeThrough‘);
    if bRtn then
        Result:=True
    else
        Result:=False;
end;
 
function IsSubScript():Boolean;
Var  bRtn:Boolean;
begin
    bRtn:= (Form1.webbrowser1.Document as IHTMLDocument2).queryCommandState(‘SubScript‘);
    if bRtn then
        Result:=True
    else
        Result:=False;
end;
 
function IsSuperScript():Boolean;
Var  bRtn:Boolean;
begin
    bRtn:= (Form1.webbrowser1.Document as IHTMLDocument2).queryCommandState(‘SuperScript‘);
    if bRtn then
        Result:=True
    else
        Result:=False;
end;
 
function IsJustifyLeft():Boolean;
Var  bRtn:Boolean;
begin
    bRtn:= (Form1.webbrowser1.Document as IHTMLDocument2).queryCommandState(‘JustifyLeft‘);
    if bRtn then
        Result:=True
    else
        Result:=False;
end;
 
function IsJustifyCenter():Boolean;
Var  bRtn:Boolean;
begin
    bRtn:= (Form1.webbrowser1.Document as IHTMLDocument2).queryCommandState(‘JustifyCenter‘);
    if bRtn then
        Result:=True
    else
        Result:=False;
end;
 
function IsJustifyRight():Boolean;
Var  bRtn:Boolean;
begin
    bRtn:= (Form1.webbrowser1.Document as IHTMLDocument2).queryCommandState(‘JustifyRight‘);
    if bRtn then
        Result:=True
    else
        Result:=False;
end;
 
function IsJustifyFull():Boolean;
Var  bRtn:Boolean;
begin
    bRtn:= (Form1.webbrowser1.Document as IHTMLDocument2).queryCommandState(‘JustifyFull‘);
    if bRtn then
        Result:=True
    else
        Result:=False;
end;
 
function IsInsertOrderedList():Boolean;
Var  bRtn:Boolean;
begin
    bRtn:= (Form1.webbrowser1.Document as IHTMLDocument2).queryCommandState(‘InsertOrderedList‘);
    if bRtn then
        Result:=True
    else
        Result:=False;
end;
 
function IsInsertUnorderedList():Boolean;
Var  bRtn:Boolean;
begin
    bRtn:= (Form1.webbrowser1.Document as IHTMLDocument2).queryCommandState(‘InsertUnorderedList‘);
    if bRtn then
        Result:=True
    else
        Result:=False;
end;
///使用
 
procedure TForm1.WebBrowser1CommandStateChange(ASender: TObject;
  Command: Integer; Enable: WordBool);
Var  bRtn:Boolean;
begin
 
try
  cbb_FontNameList.Text:=GetFontName();
  cbb_FontSize.Text:=GetFontSize();
 
  btn_Bold.Down:=IsBold();
  btn_Italic.Down:=IsItalic();
  btn_Underline.Down:=IsUnderline();
  btn_strikethrough.Down:=IsStrikeThrough();
 
  btn_SubScript.Down:=IsSubScript();
  btn_SuperScript.Down:=IsSuperScript();
 
  ToolButton_AlignTwo.Down:=IsJustifyFull();
  ToolButton_AlignLeft.Down:=IsJustifyLeft();
  ToolButton_AlignCenter.Down:=IsJustifyCenter();
  ToolButton_AlignRight.Down:=IsJustifyRight();
 
  ToolButton_UnoredredList.Down:=IsInsertUnorderedList();
  ToolButton_OrderedList.Down:=IsInsertOrderedList();
  //格式化
except
  Exit;
end;
end;

 

 

   

图


 

备注

这个主要应用在工具栏按钮感应上

 

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