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Date: Mon, 21 Mar 2011 18:20:00 -0700
Message-ID: <AANLkTindD0g3Ch83ZXNhxecH7zh_tEbNj2SWNHs3gUyP@mail.gmail.com>
Subject: OS variation in key listeners
From: Bill van Melle <bill.van.melle@gmail.com>
To: user@pivot.apache.org
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This is a followup to that thread (
http://apache-pivot-users.399431.n3.nabble.com/KeyListeners-on-ImageView-td2600622.html)
people thought was getting too long.

I followed Chris's advice about making Window focusable -- create a trivial
class

public class FocusableWindowSkin extends WindowSkin {
@Override
 public boolean isFocusable() {
return true;
}
}

and install it in my app's startup method

    Theme.getTheme().set(Window.class, FocusableWindowSkin.class);

Then when I want to create a brand new OS window
with DesktopApplicationContext.createDisplay, I tell the Pivot Window that I
put in the OS window to requestFocus(), which now succeeds.  After that it's
just a matter of handling key strokes.

On Windows XP, the following works for me to intercept the Escape key as a
shortcut for closing the window:

this.getComponentKeyListeners().add(new ComponentKeyListener.Adapter() {
    @Override
    public boolean keyTyped(Component component, char character) {
        if (character == Keyboard.KeyCode.ESCAPE) {
            closeHostWindow();
            return true;
        }
        return false;
    }
});

(where closeHostWindow does this.getDisplay().getHostWindow().dispose(); --
is that the right thing?)

However, on Mac OS X and Ubuntu Linux, it doesn't work.  At first I thought
it might be something about key codes, but I set a breakpoint, and keyTyped
doesn't get called at all.  The following alternative *does* work on all 3
OS's:

this.getActionMappings().add(new ActionMapping(
    new Keyboard.KeyStroke(Keyboard.KeyCode.ESCAPE, 0),
    new Action() {
        @Override
        public void perform(Component source) {
            closeHostWindow();
        }
}));

Although I'm vaguely curious why this should be so, I'm mainly putting this
out as a FYI for anyone searching on this topic.

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This is a followup to that thread (<a href=3D"http://apache-pivot-users.399=
431.n3.nabble.com/KeyListeners-on-ImageView-td2600622.html" target=3D"_blan=
k">http://apache-pivot-users.399431.n3.nabble.com/KeyListeners-on-ImageView=
-td2600622.html</a>) people thought was getting too long.<div>

<br></div><div>I followed Chris&#39;s advice about making Window focusable =
-- create a trivial class</div><div><br></div><div><div>public class Focusa=
bleWindowSkin extends WindowSkin {</div><div><span style=3D"white-space:pre=
-wrap">	</span>@Override</div>

<div><span style=3D"white-space:pre-wrap">	</span>public boolean isFocusabl=
e() {</div><div><span style=3D"white-space:pre-wrap">		</span>return true;<=
/div><div><span style=3D"white-space:pre-wrap">	</span>}</div>
<div>}</div></div><div><br></div><div>and install it in my app&#39;s startu=
p method</div><div><br></div><div>=A0=A0 =A0Theme.getTheme().set(Window.cla=
ss, FocusableWindowSkin.class);</div><div><br></div><div>Then when I want t=
o create a brand new OS window with=A0DesktopApplicationContext.createDispl=
ay, I tell the Pivot Window that I put in the OS window to=A0requestFocus()=
, which now succeeds. =A0After that it&#39;s just a matter of handling key =
strokes.</div>

<div><br></div><div>On Windows XP, the following works for me to intercept =
the Escape key as a shortcut for closing the window:</div><div><br></div><d=
iv><div>this.getComponentKeyListeners().add(new ComponentKeyListener.Adapte=
r() {=A0</div>

<div>=A0=A0 =A0@Override</div><div>=A0=A0 =A0public boolean keyTyped(Compon=
ent component, char character) {</div><div>=A0=A0 =A0 =A0 =A0if (character =
=3D=3D Keyboard.KeyCode.ESCAPE) {</div><div>=A0=A0 =A0 =A0 =A0 =A0 =A0close=
HostWindow();</div><div>=A0=A0 =A0 =A0 =A0 =A0 =A0return true;</div>

<div>=A0=A0 =A0 =A0 =A0}</div><div>=A0=A0 =A0 =A0 =A0return false;</div><di=
v>=A0=A0 =A0}</div><div>});</div></div><div><br></div><div>(where closeHost=
Window does=A0this.getDisplay().getHostWindow().dispose(); -- is that the r=
ight thing?)</div><div>
<br></div><div>However, on Mac OS X and Ubuntu Linux, it doesn&#39;t work. =
=A0At first I thought it might be something about key codes, but I set a br=
eakpoint, and keyTyped doesn&#39;t get called at all. =A0The following alte=
rnative *does* work on all 3 OS&#39;s:</div>

<div><br></div><div><div>this.getActionMappings().add(new ActionMapping(</d=
iv><div>=A0=A0 =A0new Keyboard.KeyStroke(Keyboard.KeyCode.ESCAPE, 0),</div>=
<div>=A0=A0 =A0new Action() {</div><div>=A0=A0 =A0 =A0 =A0@Override</div><d=
iv>=A0=A0 =A0 =A0 =A0public void perform(Component source) {</div>

<div>=A0=A0 =A0 =A0 =A0 =A0 =A0closeHostWindow();</div><div>=A0=A0 =A0 =A0 =
=A0}</div><div>}));</div></div><div><br></div><div>Although I&#39;m vaguely=
 curious why this should be so, I&#39;m mainly putting this out as a FYI fo=
r anyone=A0searching=A0on this topic.</div>


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