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{
***************************************************************************
* *
* This source is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
* This code is distributed in the hope that it will be useful, but *
* WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU *
* General Public License for more details. *
* *
* A copy of the GNU General Public License is available on the World *
* Wide Web at <http://www.gnu.org/copyleft/gpl.html>. You can also *
* obtain it by writing to the Free Software Foundation, *
* Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1335, USA. *
* *
***************************************************************************
Abstract:
This example implements a help viewer using the turbo power
ipro browser component.
procedure RegisterHelpViewer;
need to be called to register this viewer. The sample calls it in the
OnCreate of the main form.
}
unit HtmlHelp2Viewer;
{$mode objfpc}{$H+}
interface
uses
Classes, SysUtils, LResources, Forms, Controls, Graphics, Dialogs, ExtCtrls,
LCLProc, IpHtml, Buttons, helpintfs, lazhelpintf, ComCtrls, ipfilebroker,
iputils;
type
{ THelpViewerForm }
THelpViewerForm = class(TForm)
IHP: TIpHtmlPanel;
DataProvider: TIpFileDataProvider;
Panel1: TPanel;
IndexButton: TSpeedButton;
BackButton: TSpeedButton;
ForwardButton: TSpeedButton;
StatusBar1: TStatusBar;
procedure BackButtonClick(Sender: TObject);
procedure ForwardButtonClick(Sender: TObject);
procedure IHPDocumentOpen(Sender: TObject);
procedure IHPHotChange(Sender: TObject);
procedure IndexButtonClick(Sender: TObject);
private
public
{ public declarations }
procedure showURL(URL : String);
end;
var
HelpViewerForm: THelpViewerForm;
procedure RegisterHelpViewer;
implementation
{$R htmlhelp2viewer.lfm}
type
{ THTMLHelpViewer }
THTMLHelpViewer = class(THelpViewer)
private
public
constructor Create(TheOwner: TComponent); override;
function ShowNode(Node: THelpNode; var ErrMsg: string): TShowHelpResult; override;
published
property AutoRegister;
end;
{ THTMLHelpViewer }
constructor THTMLHelpViewer.Create(TheOwner: TComponent);
begin
inherited Create(TheOwner);
AddSupportedMimeType('text/html');
end;
function THTMLHelpViewer.ShowNode(Node: THelpNode; var ErrMsg: string): TShowHelpResult;
begin
DebugLn (Format('THTMLHelpViewer.ShowNode: URL:"%s" ID:"%s" Context:"%d"',[Node.URL,Node.ID,Node.Context]));
HelpViewerForm.ShowURL(Node.URL);
result := shrSuccess; // we should return a "better" result ;-)
end;
var Help_Viewer : THTMLHelpViewer = nil;
procedure RegisterHelpViewer;
begin
if Help_Viewer = nil then // if not already done
begin
Help_Viewer := THTMLHelpViewer.Create(nil); // create the viewer and
Help_Viewer.RegisterSelf; // register it in the help system
end;
end;
{ THelpViewerForm }
procedure THelpViewerForm.IndexButtonClick(Sender: TObject);
begin
ShowHelpOrErrorForKeyword('','HTML/index.html'); // HTML is case sensitive
end;
// Show URL of a link in Status Bar
procedure THelpViewerForm.IHPHotChange(Sender: TObject);
begin
StatusBar1.Panels[0].Text := IHP.HotURL;
end;
procedure THelpViewerForm.BackButtonClick(Sender: TObject);
begin
IHP.GoBack;
end;
procedure THelpViewerForm.ForwardButtonClick(Sender: TObject);
begin
IHP.GoForward;
end;
procedure THelpViewerForm.IHPDocumentOpen(Sender: TObject);
begin
BackButton.Enabled := IHP.canGoBack;
ForwardButton.Enabled := IHP.canGoForward;
end;
procedure THelpViewerForm.showURL(URL : String);
begin
Show;
URL := expandLocalHtmlFileName (URL);
IHP.OpenURL(URL);
BringToFront; // needed if already open and another help is shown
end;
finalization
FreeAndNil(Help_Viewer);
end.
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