TPageControl 上有多个 TWebBrowser 时, 如何协调 Back、Forward - 回复 "飘逸的蓝" 的问题
作者:互联网
TPageControl 上有多个 TWebBrowser 时, 如何协调 Back、Forward - 回复 "飘逸的蓝" 的问题
问题来源: http://www.cnblogs.com/del/archive/2007/12/13/993840.html#1804933
代码:
unit Unit1; interface uses Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms, Dialogs, StdCtrls, ExtCtrls, OleCtrls, SHDocVw, ComCtrls; type TForm1 = class(TForm) Panel1: TPanel; Edit1: TEdit; Button1: TButton; Button2: TButton; Button3: TButton; PageControl1: TPageControl; procedure CommandStateChange(ASender: TObject; Command: Integer; Enable: WordBool); procedure Button1Click(Sender: TObject); procedure Button2Click(Sender: TObject); procedure Button3Click(Sender: TObject); procedure FormCreate(Sender: TObject); procedure PageControl1Changing(Sender: TObject; var AllowChange: Boolean); procedure PageControl1Change(Sender: TObject); end; var Form1: TForm1; implementation {$R *.dfm} var TabSheetArr : array[0..2] of TTabSheet; WebBrowserArr: array[0..2] of TWebBrowser; BoolArr : array[0..2] of record B,F: Boolean end; WebActive: TWebBrowser; procedure TForm1.FormCreate(Sender: TObject); var i: Integer; begin Button1.Caption := 'Go'; Button1.Default := True; Button2.Caption := 'Back'; Button3.Caption := 'Forward'; Button2.Enabled := False; Button3.Enabled := False; Edit1.Text := 'http://del.cnblogs.com'; for i := 0 to Length(TabSheetArr) - 1 do begin TabSheetArr[i] := TTabSheet.Create(PageControl1); TabSheetArr[i].PageControl := PageControl1; TabSheetArr[i].Caption := 'TabSheet' + IntToStr(i+1); WebBrowserArr[i] := TWebBrowser.Create(TabSheetArr[i]); TWinControl(WebBrowserArr[i]).Parent := TabSheetArr[i]; WebBrowserArr[i].Align := alClient; end; PageControl1.ActivePageIndex := 0; WebActive := WebBrowserArr[0]; WebActive.Navigate(Edit1.Text); WebActive.OnCommandStateChange := CommandStateChange; end; procedure TForm1.PageControl1Changing(Sender: TObject; var AllowChange: Boolean); var i: Integer; begin i := PageControl1.ActivePageIndex; BoolArr[i].B := Button2.Enabled; BoolArr[i].F := Button3.Enabled; end; procedure TForm1.PageControl1Change(Sender: TObject); var i: Integer; begin i := PageControl1.ActivePageIndex; WebActive := WebBrowserArr[i]; Edit1.Text := WebActive.LocationURL; WebActive.OnCommandStateChange := CommandStateChange; Button2.Enabled := BoolArr[i].B; Button3.Enabled := BoolArr[i].F; end; procedure TForm1.Button1Click(Sender: TObject); begin WebActive.Navigate(Edit1.Text); end; procedure TForm1.Button2Click(Sender: TObject); begin WebActive.GoBack; end; procedure TForm1.Button3Click(Sender: TObject); begin WebActive.GoForward; end; procedure TForm1.CommandStateChange(ASender: TObject; Command: Integer; Enable: WordBool); begin case Command of CSC_NAVIGATEBACK : Button2.Enabled := Enable; CSC_NAVIGATEFORWARD: Button3.Enabled := Enable; end; end; end.
窗体:
object Form1: TForm1 Left = 0 Top = 0 Caption = 'Form1' ClientHeight = 388 ClientWidth = 737 Color = clBtnFace Font.Charset = DEFAULT_CHARSET Font.Color = clWindowText Font.Height = -11 Font.Name = 'Tahoma' Font.Style = [] OldCreateOrder = False OnCreate = FormCreate PixelsPerInch = 96 TextHeight = 13 object Panel1: TPanel Left = 0 Top = 0 Width = 737 Height = 30 Align = alTop Caption = 'Panel1' TabOrder = 0 DesignSize = ( 737 30) object Edit1: TEdit Left = 8 Top = 5 Width = 425 Height = 21 TabOrder = 0 Text = 'Edit1' end object Button1: TButton Left = 439 Top = 2 Width = 66 Height = 25 Caption = 'Button1' TabOrder = 1 OnClick = Button1Click end object Button2: TButton Left = 574 Top = 2 Width = 75 Height = 25 Anchors = [akTop, akRight] Caption = 'Button2' TabOrder = 2 OnClick = Button2Click end object Button3: TButton Left = 655 Top = 2 Width = 75 Height = 25 Anchors = [akTop, akRight] Caption = 'Button3' TabOrder = 3 OnClick = Button3Click end end object PageControl1: TPageControl Left = 0 Top = 30 Width = 737 Height = 358 Align = alClient TabOrder = 1 OnChange = PageControl1Change OnChanging = PageControl1Changing end end
把上面的例子全部改成动态建立的方法(在之前的窗体上多加一个 Button4 用于添加页面):
unit Unit1; interface uses Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms, Dialogs, StdCtrls, ExtCtrls, OleCtrls, SHDocVw, ComCtrls; type TForm1 = class(TForm) Panel1: TPanel; Edit1: TEdit; Button1: TButton; Button2: TButton; Button3: TButton; PageControl1: TPageControl; Button4: TButton; procedure CommandStateChange(ASender: TObject; Command: Integer; Enable: WordBool); procedure Button3Click(Sender: TObject); procedure Button1Click(Sender: TObject); procedure Button2Click(Sender: TObject); procedure FormCreate(Sender: TObject); procedure PageControl1Changing(Sender: TObject; var AllowChange: Boolean); procedure PageControl1Change(Sender: TObject); procedure Button4Click(Sender: TObject); private procedure GetBackForwardBool; end; var Form1: TForm1; implementation {$R *.dfm} var TabSheetArr : array of TTabSheet; WebBrowserArr: array of TWebBrowser; BoolArr : array of record B,F: Boolean end; WebActive: TWebBrowser; procedure TForm1.FormCreate(Sender: TObject); var i: Integer; begin Button1.Caption := 'Go'; Button1.Default := True; Button2.Caption := 'Back'; Button3.Caption := 'Forward'; Button2.Enabled := False; Button3.Enabled := False; Button4.Caption := 'AddPage'; Button4.Click; WebActive := WebBrowserArr[0]; WebActive.OnCommandStateChange := CommandStateChange; end; procedure TForm1.GetBackForwardBool; begin BoolArr[PageControl1.ActivePageIndex].B := Button2.Enabled; BoolArr[PageControl1.ActivePageIndex].F := Button3.Enabled; end; procedure TForm1.PageControl1Changing(Sender: TObject; var AllowChange: Boolean); begin GetBackForwardBool; end; procedure TForm1.PageControl1Change(Sender: TObject); var i: Integer; begin i := PageControl1.ActivePageIndex; WebActive := WebBrowserArr[i]; Edit1.Text := WebActive.LocationURL; WebActive.OnCommandStateChange := CommandStateChange; Button2.Enabled := BoolArr[i].B; Button3.Enabled := BoolArr[i].F; end; procedure TForm1.Button1Click(Sender: TObject); begin WebActive.Navigate(Edit1.Text); end; procedure TForm1.Button2Click(Sender: TObject); begin WebActive.GoBack; end; procedure TForm1.Button3Click(Sender: TObject); begin WebActive.GoForward; end; procedure TForm1.Button4Click(Sender: TObject); var n: Integer; begin n := Length(TabSheetArr); if n > 0 then GetBackForwardBool; SetLength(TabSheetArr, n+1); SetLength(WebBrowserArr, n+1); SetLength(BoolArr, n+1); TabSheetArr[n] := TTabSheet.Create(PageControl1); TabSheetArr[n].PageControl := PageControl1; TabSheetArr[n].Caption := 'TabSheet' + IntToStr(n+1); WebBrowserArr[n] := TWebBrowser.Create(TabSheetArr[n]); TWinControl(WebBrowserArr[n]).Parent := TabSheetArr[n]; WebBrowserArr[n].Align := alClient; PageControl1.ActivePageIndex := n; PageControl1.OnChange(PageControl1); end; procedure TForm1.CommandStateChange(ASender: TObject; Command: Integer; Enable: WordBool); begin case Command of CSC_NAVIGATEBACK : Button2.Enabled := Enable; CSC_NAVIGATEFORWARD: Button3.Enabled := Enable; end; end; end.posted on 2010-04-19 22:58 万一 阅读(4575) 评论(20) 编辑 收藏
标签:end,Sender,WebActive,Back,TObject,TForm1,TWebBrowser,TPageControl,procedure 来源: https://blog.51cto.com/u_14617575/2745743