- Dragging -Success!

From: Douglas G. Danforth <"Douglas>
Date: Sun, 24 Sep 2006 10:53:56 -0400

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Dragging now works!

I had to resort to Services.Action to allow the system to breath.
That is, a call to my handleMouse would ask for a Views.Update and
then immediately return to process Ports.Input which would again
call my handleMouse. But this actually gave no cycles to the system
to let the Views.Update messages flow through the system.

Hence I implemented the code as follows:

        Action = POINTER TO RECORD(Services.Action)
                        view: View;
                        f: Views.Frame;
                        msg: Controllers.TrackMsg;
                        x,y: INTEGER;
                        END;

    PROCEDURE (a: Action) Do;
        VAR isDown: BOOLEAN;
    BEGIN
        IF (a.msg.x # a.x) OR (a.msg.y # a.y) THEN
            a.view.handleMouse(a.msg.x DIV a.f.unit, a.msg.y DIV
a.f.unit, a.msg.modifiers);
            a.x := a.msg.x; a.y := a.msg.y;
        END;
        a.f.Input(a.msg.x, a.msg.y, a.msg.modifiers, isDown);
        IF isDown THEN Services.DoLater(a, Services.now) END
    END Do;
   
    PROCEDURE (v: View) HandleCtrlMsg (f: Views.Frame; VAR msg:
Controllers.Message; VAR focus: Views.View);
        VAR x, y, w, h: INTEGER; isDown: BOOLEAN; action: Action;
    BEGIN
        (* here comes the behavior which is specific to this wrapper -
            it modifies the wrapped view's behavior *)
        IF (msg IS Controllers.EditMsg) & (v.handleKey # NIL) THEN
            WITH msg: Controllers.EditMsg DO
                IF (msg.op = Controllers.pasteChar) THEN
v.handleKey(msg.char) END
            END
        ELSIF (msg IS Controllers.TrackMsg) & (v.handleMouse # NIL) THEN
            WITH msg: Controllers.TrackMsg DO
                v.handleMouse(msg.x DIV f.unit, msg.y DIV f.unit,
msg.modifiers);
                x := msg.x; y := msg.y;
                f.Input(msg.x, msg.y, msg.modifiers, isDown);
                IF isDown THEN
                    NEW(action);
                    action.view := v;
                    action.f := f;
                    action.msg := msg;
                    action.x := x; action.y := y;
                    Services.DoLater(action, Services.now)
                END
            END
        END;
        focus := v.inner (* forward all controller messages to
wrapped view *)
    END HandleCtrlMsg;

-Doug Danforth

--- BlackBox
--- send subject HELP or UNSUBSCRIBE to blackbox{([at]})nowhere.xy


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Received on Sun Sep 24 2006 - 16:53:56 UTC