如何检测Delphi中的向前和向后鼠标按钮事件？ [英] How to Detect Forward and Back Mouse Button Events in Delphi?

问题描述

如果鼠标除了标准左/右/中间（例如前进/后退）之外还有其他按钮，那么我们如何在Delphi中检测到这些按钮点击？

If a mouse has other buttons in addition to the standard left/right/middle (e.g. forward/back), how can we detect those button clicks in Delphi?

如何使用它的一个例子是Internet Explorer，其中Logitech或MS鼠标一侧的前进/后退按钮在任何加载的网页之间循环前进和后退。这似乎在键盘上复制Backspace / CTRL + Backspace，但是我试图检测到使用KeyPreview和KeyPress事件，但是它不会接受。

An example of how this is used is the Internet Explorer, where the forward/back button on the side of a Logitech or MS mouse cycles forward and back between any loaded web pages. This seems to replicate the Backspace/CTRL+Backspace on the keyboard but I tried to detect that using KeyPreview and the KeyPress event but it does not pick it up.

任何想法如何检测这些扩展鼠标按钮的点击？

Any idea how to detect clicks on these extended mouse buttons?

推荐答案

您需要捕获WM_APPCOMMAND消息，然后使用GET_APPCOMMAND_LPARAM。基本上是这样的：

You need to capture the WM_APPCOMMAND message and then extract the specific command request using GET_APPCOMMAND_LPARAM. Basically, something like this:

type
  TMyForm = class(TForm)
  private
    procedure WMAppCommand(var Msg: TMessage); message WM_APPCOMMAND;
  end;

procedure TMyForm.WMAppCommand(var Msg: TMessage);
begin
  case GET_APPCOMMAND_LPARAM(Msg.LParam) of
    APPCOMMAND_BROWSER_BACKWARD:
    begin
      // Do "go back" code
      Msg.Result := 1;
    end;
  end;
end;

以下是相关的标题翻译：

Here's the relevant header translation:

unit AppCommand;

{$RANGECHECKS OFF}

interface

uses
  Windows;

const
  WM_APPCOMMAND = $0319;

const
  // Windows 2000, ME, and above
  APPCOMMAND_BROWSER_BACKWARD                   = 1;
  APPCOMMAND_BROWSER_FORWARD                    = 2;
  APPCOMMAND_BROWSER_REFRESH                    = 3;
  APPCOMMAND_BROWSER_STOP                       = 4;
  APPCOMMAND_BROWSER_SEARCH                     = 5;
  APPCOMMAND_BROWSER_FAVORITES                  = 6;
  APPCOMMAND_BROWSER_HOME                       = 7;
  APPCOMMAND_VOLUME_MUTE                        = 8;
  APPCOMMAND_VOLUME_DOWN                        = 9;
  APPCOMMAND_VOLUME_UP                          = 10;
  APPCOMMAND_MEDIA_NEXTTRACK                    = 11;
  APPCOMMAND_MEDIA_PREVIOUSTRACK                = 12;
  APPCOMMAND_MEDIA_STOP                         = 13;
  APPCOMMAND_MEDIA_PLAY_PAUSE                   = 14;
  APPCOMMAND_LAUNCH_MAIL                        = 15;
  APPCOMMAND_LAUNCH_MEDIA_SELECT                = 16;
  APPCOMMAND_LAUNCH_APP1                        = 17;
  APPCOMMAND_LAUNCH_APP2                        = 18;
  APPCOMMAND_BASS_DOWN                          = 19;
  APPCOMMAND_BASS_BOOST                         = 20;
  APPCOMMAND_BASS_UP                            = 21;
  APPCOMMAND_TREBLE_DOWN                        = 22;
  APPCOMMAND_TREBLE_UP                          = 23;
  // Windows XP and above
  APPCOMMAND_MICROPHONE_VOLUME_MUTE             = 24;
  APPCOMMAND_MICROPHONE_VOLUME_DOWN             = 25;
  APPCOMMAND_MICROPHONE_VOLUME_UP               = 26;
  APPCOMMAND_HELP                               = 27;
  APPCOMMAND_FIND                               = 28;
  APPCOMMAND_NEW                                = 29;
  APPCOMMAND_OPEN                               = 30;
  APPCOMMAND_CLOSE                              = 31;
  APPCOMMAND_SAVE                               = 32;
  APPCOMMAND_PRINT                              = 33;
  APPCOMMAND_UNDO                               = 34;
  APPCOMMAND_REDO                               = 35;
  APPCOMMAND_COPY                               = 36;
  APPCOMMAND_CUT                                = 37;
  APPCOMMAND_PASTE                              = 38;
  APPCOMMAND_REPLY_TO_MAIL                      = 39;
  APPCOMMAND_FORWARD_MAIL                       = 40;
  APPCOMMAND_SEND_MAIL                          = 41;
  APPCOMMAND_SPELL_CHECK                        = 42;
  APPCOMMAND_DICTATE_OR_COMMAND_CONTROL_TOGGLE  = 43;
  APPCOMMAND_MIC_ON_OFF_TOGGLE                  = 44;
  APPCOMMAND_CORRECTION_LIST                    = 45;
  // Windows XP SP1 and above
  APPCOMMAND_MEDIA_PLAY                         = 46;
  APPCOMMAND_MEDIA_PAUSE                        = 47;
  APPCOMMAND_MEDIA_RECORD                       = 48;
  APPCOMMAND_MEDIA_FAST_FORWARD                 = 49;
  APPCOMMAND_MEDIA_REWIND                       = 50;
  APPCOMMAND_MEDIA_CHANNEL_UP                   = 51;
  APPCOMMAND_MEDIA_CHANNEL_DOWN                 = 52;

  FAPPCOMMAND_MOUSE = $8000;
  FAPPCOMMAND_KEY   = 0;
  FAPPCOMMAND_OEM   = $1000;
  FAPPCOMMAND_MASK  = $F000;

  // Mouse buttons;  remaining ones are declared in Windows.pas
  MK_XBUTTON1 = $20;
  MK_XBUTTON2 = $40;

function GET_APPCOMMAND_LPARAM(lParam: LPARAM): Short;
function GET_DEVICE_LPARAM(lParam: LPARAM): Word;
function GET_KEYSTATE_LPARAM(lParam: LPARAM): Word;


implementation

function GET_APPCOMMAND_LPARAM(lParam: LPARAM): Short;
begin
  Result := HiWord(lParam) and not FAPPCOMMAND_MASK;
end;

function GET_DEVICE_LPARAM(lParam: LPARAM): Word;
begin
  Result := HiWord(lParam) and FAPPCOMMAND_MASK;
end;

function GET_KEYSTATE_LPARAM(lParam: LPARAM): Word;
begin
  Result := LoWord(lParam);
end;

end.

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