如何在 Squeak / Morphic GUI 中使用鼠标滚轮

发布于 2024-08-18 07:54:53 字数 252 浏览 22 评论 0原文

我正在使用 Morphic / Squeak 实现图形用户界面。有些项目具有拖拽功能。删除功能。拖动时，我希望能够使用鼠标滚轮旋转这些项目。

第一个问题是使用鼠标滚轮结束拖动操作并导致放置（尝试）。我怎样才能抑制它 - 并同时触发 mouseWheelEvent ？

第二个问题：如何为我的 Morph 分配鼠标滚轮事件？如上所述，此事件仅在拖动此变形时才相关。（已解决）

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牵你的手，一向走下去 2024-08-25 07:54:53

似乎在选择支持它的 VM 实现上，Squeak 将鼠标滚轮映射到 Ctrl 向上箭头 和 Ctrl-向下箭头 键事件。例如，在 Win32 上 sqWin32Window.c：

if( WM_MOUSEWHEEL == message || g_WM_MOUSEWHEEL == message ) {
    /* Record mouse wheel msgs as CTRL-Up/Down */
    short zDelta = (short) HIWORD(wParam);
    if(inputSemaphoreIndex) {
        sqKeyboardEvent *evt = (sqKeyboardEvent*) sqNextEventPut();
        evt->type = EventTypeKeyboard;
        evt->timeStamp = lastMessage->time;
        evt->charCode = (zDelta > 0) ? 30 : 31;
        evt->pressCode = EventKeyChar;
        evt->modifiers = CtrlKeyBit;
        evt->utf32Code = 0;
        evt->reserved1 = 0;
    } else {
        buttonState = 64;
        if (zDelta < 0) {
            recordVirtualKey(message,VK_DOWN,lParam);
        } else {
            recordVirtualKey(message,VK_UP,lParam);
        }
    }
    return 1;
}

这就是您在 Squeak 中需要使用的内容。（如果您使用的是 Polymorph 扩展，则有一个特殊的 mouseWheel 事件，但它们所做的只是过滤 Ctrl-Up 和 Ctrl-Down 并生成“假”MouseWheelEvent< /code> 消息。）

查看 HandMorph 中 handleEvent 的一些代码：

evt isMouse ifTrue:[
    self sendListenEvent: evt to: self mouseListeners.
    lastMouseEvent _ evt].

    "Check for pending drag or double click operations."
    mouseClickState ifNotNil:[
        (mouseClickState handleEvent: evt from: self) ifFalse:[
        "Possibly dispatched #click: or something and will not re-establish otherwise"
        ^self mouseOverHandler processMouseOver: lastMouseEvent]].

        evt isMove ifTrue:[
            self position: evt position.
            self sendMouseEvent: evt.
        ] ifFalse:[
            "Issue a synthetic move event if we're not at the position of the event"
            (evt position = self position) ifFalse:[self moveToEvent: evt].
            "Drop submorphs on button events"
            (self hasSubmorphs) 
                ifTrue:[self dropMorphs: evt]
                ifFalse:[self sendMouseEvent: evt].
        ].

Polymorph MouseWheelEvent 是 MouseEvent 的子类，它不返回 true 到 isMove，因此你会得到一个掉落。如果你想让它起作用，你必须在这里改变一些东西。

Appears that on VM implementations that have chosen to support it, Squeak maps the mouse wheel to Ctrl Up-Arrow and Ctrl-Down-Arrow key events. For instance, on Win32 in sqWin32Window.c:

if( WM_MOUSEWHEEL == message || g_WM_MOUSEWHEEL == message ) {
    /* Record mouse wheel msgs as CTRL-Up/Down */
    short zDelta = (short) HIWORD(wParam);
    if(inputSemaphoreIndex) {
        sqKeyboardEvent *evt = (sqKeyboardEvent*) sqNextEventPut();
        evt->type = EventTypeKeyboard;
        evt->timeStamp = lastMessage->time;
        evt->charCode = (zDelta > 0) ? 30 : 31;
        evt->pressCode = EventKeyChar;
        evt->modifiers = CtrlKeyBit;
        evt->utf32Code = 0;
        evt->reserved1 = 0;
    } else {
        buttonState = 64;
        if (zDelta < 0) {
            recordVirtualKey(message,VK_DOWN,lParam);
        } else {
            recordVirtualKey(message,VK_UP,lParam);
        }
    }
    return 1;
}

So that's pretty much what you've got to work with inside Squeak. (If you're using the Polymorph extensions, there is a special mouseWheel event, but all they're doing is filtering Ctrl-Up and Ctrl-Down and generating a "fake" MouseWheelEvent message.)

Looking at a bit of code for handleEvent in HandMorph:

evt isMouse ifTrue:[
    self sendListenEvent: evt to: self mouseListeners.
    lastMouseEvent _ evt].

    "Check for pending drag or double click operations."
    mouseClickState ifNotNil:[
        (mouseClickState handleEvent: evt from: self) ifFalse:[
        "Possibly dispatched #click: or something and will not re-establish otherwise"
        ^self mouseOverHandler processMouseOver: lastMouseEvent]].

        evt isMove ifTrue:[
            self position: evt position.
            self sendMouseEvent: evt.
        ] ifFalse:[
            "Issue a synthetic move event if we're not at the position of the event"
            (evt position = self position) ifFalse:[self moveToEvent: evt].
            "Drop submorphs on button events"
            (self hasSubmorphs) 
                ifTrue:[self dropMorphs: evt]
                ifFalse:[self sendMouseEvent: evt].
        ].

The Polymorph MouseWheelEvent is a subclass of MouseEvent that doesn't return true to isMove, hence you get a drop. You'll have to change something here if you want this to work.

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