JMenu is behind Canvas. problem ?

I have created a JFrame with a JMenuBar,
I have added a ImageCanvas (sub class of Canvas) in the center of the JFrame
but whenever i click on Menu it appears behind the canvas
what to do pls help?

Hey,
Canvas is an awt component meaning it is a heavyweight
component. The swing components are lightweight.
Thats the problem.
Have a look at the following URL.
http://java.sun.com/products/jfc/tsc/articles/mixing/
It should explain about mixing heavyweight/lightweight
components
Basically you either need to use Frame, Menu and
canvas or JFrame, JMenu and JPanel.
nesAnd heres the important part:
"When a lightweight component overlaps a heavyweight component, the heavyweight component is always on top,
regardless of the relative z-order of the two components."
Use JPanel instead of canvas if your using swing.
regards,
Tim

Similar Messages

FW CS4 Canvas problems - PC Vista Home

Hi
I have just installed CS4 and am having a few problems with
Fireworks.
1. If I have several floating canvases (separate images) and
I open another image, the image opens behind all the other open
windows. When I click the new image; it remains behind and obscured
by all the other canvases and doesn't come to the front as it would
in any other application.to get the new image to the front, I have
to close all the other image!! Sometimes I can get the new canvas
to the front by clicking each and every other canvas once, which
kind of wakes it up. Does anyone know a way around this?
2. Similar to above. Often when I open a new image with other
images already open on separate canvases, the new image loads into
another already open canvas. This generates a tab on that canvas.
There doesn't seem to be any control over which canvas it
populates. It doesn't even load into the last canvas I was using
before opening it. It seems quite random. If I have many canvases
open, I have to literally hunt for the new image. Does anyone know
how to get new opened images to load onto their own canvases?
3. This is maybe more of a niggle. When I drag a canvas
around the workspace, the whole canvas turns grey until I release
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1 and 2 above have hampered my productivity so much, I am
using CS3 again.
Any help would be much appreciated
Thanks
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MMisterMM wrote:
> 1. If I have several floating canvases (separate images)
and I open another
> image, the image opens behind all the other open
windows. When I click the new
> image; it remains behind and obscured by all the other
canvases and doesn't
> come to the front as it would in any other
application.to get the new image to
> the front, I have to close all the other image!!
Sometimes I can get the new
> canvas to the front by clicking each and every other
canvas once, which kind of
> wakes it up. Does anyone know a way around this?
Why not maximize them so rather than floating document
windows, they are
tabbed? Just out of curiosity, why do you have so many opened
at once?
> Does anyone know how
> to get new opened images to load onto their own
canvases?
Choose file > open.
>
> 3. This is maybe more of a niggle. When I drag a canvas
around the workspace,
> the whole canvas turns grey until I release the canvas
again. This is a pain if
> I am trying to place an image next to another image to
reference it.
Under Preferences > Edit make sure that Preview Drag is
selected.
Linda Rathgeber - Adobe Community Expert
http://www.adobe.com/communities/experts/members/8.html

Popup menu appears behind canvas component

Has anybody encountered this problem?
I attach the popup menu to the canvas component, like this:
public void mousePressed(MouseEvent e)
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The popup menu is only visible when I click the edge of the Canvas component, that is how I know that the popup is actually showing but behind the Canvas component!!!
Please help

You mean your 1 step of calling "JPopupMenu.setDefaultLightWeightPopupEnabled(false);"?
That method is meant specifically for using popup menus when you are mixing AWT and Swing components. The reason is because of the problem you first posted about. It's a way to get around that problem. But really, it's more of a hack that is used when dealing with old AWT-based components which you can't (or won't), for whatever reason, "update" to Swing versions. (Say from a 3rd-party library).
It is not recommended to mix AWT and Swing components, as already mentioned. The provided link above is an article that explains the issues with this. The fact that you can doesn't mean you should.
If you are writing this Canvas subclass yourself, and it's going to be typically used in a Swing application, you will have problems later, most likely. For example, why don't you try puting your Canvas class in a JScrollPane so you can make it bigger then the window and scrollable? You'll have scrollbar visibility issues. Fine, you can use java.awt.ScrollPane, I guess. Then I can think of several things one might do with JLayeredPanes which would create problems as well. And there is no simple "setDefaultLightWeightEnabled()" option to fix those.
So eventually, as your app, or library, matures, you start running into these problems cuz you are using AWT components where you should be using Swing components, and you start making more hack-like fixes for all these problems like using setDefaultLightWeightPopupEnabled() and explicit sizing instead of layout managers and limiting yourself to what you can do with your components.
That's why.

(another) stacked canvas on content canvas problem

I've searched the forums for the last 2+ hours and can't find a solution for my problem, although there are hundreds of questions on this subject.
I have a stacked canvas on top of a content canvas. The canvases share the same window. They also share a data block. I added radio buttons on the main canvas to "show/hide" the stacked (my ultimate goal is to have 2-3 stacked and toggle. When hide, the stacked canvas is hidden, but when i click show, it is not. I understand reading all the posts that the block with focus will display, and I've added both a go_block and go_item prior to the show_view. Below is my code. MEL_DETAILS is content and MEL_LINE_ITEM is stacked.
IF :stack = 'SHOW_STACK' THEN
GO_BLOCK('MEL_ITEM');
GO_ITEM('MEL_ITEM.MIS_PROJECT_NO');
SHOW_VIEW('MEL_LINE_ITEM');
SET_VIEW_PROPERTY('MEL_LINE_ITEM', visible, property_true);
SET_VIEW_PROPERTY('MEL_LINE_ITEM', display_position, 718, 583);
SET_ITEM_PROPERTY('PROJECTS.STACK',MOUSE_NAVIGATE,PROPERTY_FALSE); -- radio button
ELSif :stack = 'HIDE_STACK' THEN
HIDE_VIEW('MEL_LINE_ITEM');
SET_VIEW_PROPERTY('MEL_LINE_ITEM', visible, property_false);
SET_ITEM_PROPERTY('PROJECTS.STACK',MOUSE_NAVIGATE,PROPERTY_TRUE);
END IF;

user12198246 wrote:
I've searched the forums for the last 2+ hours and can't find a solution for my problem, although there are hundreds of questions on this subject.
I have a stacked canvas on top of a content canvas. The canvases share the same window. They also share a data block. I added radio buttons on the main canvas to "show/hide" the stacked (my ultimate goal is to have 2-3 stacked and toggle. When hide, the stacked canvas is hidden, but when i click show, it is not. I understand reading all the posts that the block with focus will display, and I've added both a go_block and go_item prior to the show_view. Below is my code. MEL_DETAILS is content and MEL_LINE_ITEM is stacked.
IF :stack = 'SHOW_STACK' THEN
GO_BLOCK('MEL_ITEM');
GO_ITEM('MEL_ITEM.MIS_PROJECT_NO');
SHOW_VIEW('MEL_LINE_ITEM');
SET_VIEW_PROPERTY('MEL_LINE_ITEM', visible, property_true);
SET_VIEW_PROPERTY('MEL_LINE_ITEM', display_position, 718, 583);
SET_ITEM_PROPERTY('PROJECTS.STACK',MOUSE_NAVIGATE,PROPERTY_FALSE); -- radio button
ELSif :stack = 'HIDE_STACK' THEN
HIDE_VIEW('MEL_LINE_ITEM');
SET_VIEW_PROPERTY('MEL_LINE_ITEM', visible, property_false);
SET_ITEM_PROPERTY('PROJECTS.STACK',MOUSE_NAVIGATE,PROPERTY_TRUE);
END IF;Here, it seems two problem..
The line..
SET_VIEW_PROPERTY('MEL_LINE_ITEM', visible, property_true);
and
SET_VIEW_PROPERTY('MEL_LINE_ITEM', visible, property_false);No needed
Hope this helps
Hamid

Another Drag and Drop from horizontal list to canvas problem

Hi,
This is vaguely similar to the this
topic
but I seem to have made things even more complicated.
Basic set up is a horizontal list that uses a custom
component itemrenderer to display a thumbnail and label:
<?xml version="1.0"?>

<mx:VBox xmlns:mx="
http://www.adobe.com/2006/mxml"
width="100" height="120" verticalAlign="top" verticalGap="3"
verticalScrollPolicy="off" horizontalAlign="center"
backgroundAlpha="0.0" alpha="1.0">
<mx:Image id="img" height="60" width="80"
source="assets/{data.file}" scaleContent="true"/>
<mx:Label text="{data.text}" fontWeight="bold"
width="100%" textAlign="center"/>
</mx:VBox>
The data is loaded up from an external XML file with this
sort of format:
<?xml version="1.0" encoding="UTF-8"?>
<thumbnails>
<thumb>
<file>thumb_image_1.jpg</file>
<text>Thumb 1</text>
<url>
http://www.blah.com</url>
<id>thumb1</id>
</thumb>
</thumbnails>
That's loaded up using the HTTPService and stored in a Model
thing.
I've got the dragging from the HL happening quite nicely and
it drops fine on to the canvas area, code all hack off from the
help files. The problem I'm having is finding out the data about
the item I've just dropped, I should at least be able to get the
source url for the thumbnail and the label text string, but I just
don't know how to get it. The call back I'm using looks like this:
private function doDragDrop(event:DragEvent,
target1:Canvas):void {
var vX:int = target1.mouseX;
var vY:int = target1.mouseY;
var vW:int = target1.width;
var vH:int = target1.height;
// follow variables give relative coordinate values so that
if window size is altered
// we don't have to do tricky calulations to reset rating
positions.
var vRx:Number = vX/vW;
var vRy:Number = vY/vH;
Alert.show(event.dragSource + " " + vX + " " + vY + " " +
vRx + " " + vRy, 'Mouse drop loc', mx.controls.Alert.OK);
I just don't know how to get the info out of the
event.dragSource.
Here's the full mxml:
<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="
http://www.adobe.com/2006/mxml"
layout="absolute" creationComplete="srv.send()">
<mx:Script>
<![CDATA[
private function xmlLoaded():void {
thumbAC = srv.lastResult.thumbnails;
import mx.core.DragSource;
import mx.managers.DragManager;
import mx.events.*;
import mx.containers.Canvas;
import mx.controls.Alert;
// Called when the user clicks the mouse on either colored
canvas.
// Initializes the drag.
private function dragIt(event:MouseEvent, text:String,
format:String):void {
// Get the drag initiator component from the event object.
var dragInitiator:Canvas=Canvas(event.currentTarget);
// Called if the user dragged a proxy onto the drop target
canvas.
private function doDragEnter(event:DragEvent):void {
// Get the drop target component from the event object.
var dropTarget:Canvas=Canvas(event.currentTarget);
DragManager.acceptDragDrop(dropTarget);
// Called if the target accepts the dragged object and the
user
// releases the mouse button while over the canvas.
// Handles the dragDrop event for the List control.
private function doDragDrop(event:DragEvent,
target1:Canvas):void {
var vX:int = target1.mouseX;
var vY:int = target1.mouseY;
// follow variables give relative coordinate values so that
if window size is altered
// we don't have to do tricky calulations to reset rating
positions.
Alert.show(event.dragSource + " " + vX + " " + vY, 'Mouse
drop loc', mx.controls.Alert.OK);
]]>
</mx:Script>
<mx:HTTPService id="srv" url="assets/thumbnails.xml"
useProxy="false" result="xmlLoaded();"/>
<mx:Model id="thumbAC"/>
<mx:Panel height="160" layout="absolute" title="Thumbnail
Browser" cornerRadius="10" id="thumbScrollBrowser" bottom="10"
left="10" right="10">
<mx:HorizontalList x="0" y="10" width="100%"
height="110" id="thumbBrowser"
dataProvider="{thumbAC.thumb}"
dragEnabled="true" rollOverColor="#FFFFFF"
selectionColor="#ffffff" borderColor="#FFFFFF"
borderSides="0" borderStyle="none" alpha="1"
backgroundAlpha="1.0"
itemRenderer="Thumbnail">
</mx:HorizontalList>
</mx:Panel>

<mx:ArrayCollection id="wallAC"/>
<mx:Canvas id="myCanvas" backgroundColor="#ffffff"
cornerRadius="10"
borderStyle="solid"
dragEnter="doDragEnter(event);"
dragDrop="doDragDrop(event, myCanvas);" left="10" right="10"
top="10" bottom="180">
</mx:Canvas>
</mx:Application>
Thanks for any thoughts.
Cheers,
Rob

This in the drop handler should give you back the XML you
just dropped:
var getListData:XML=
evtDrag.dragSource.dataForFormat("items");

Color flicker? Florescent lights? Viewer to Canvas problem?

Hello everyone,
I shot on a Sony HZ5u,
in Smooth Slow Record,
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Hi,
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I have constructed a simple GUI, with a menu and a Canvas for displaying images(jpg,gif).
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Code:
private void LoadActionPerformed(java.awt.event.ActionEvent evt) {
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The problem is that the image hasent finished loading when you try painting it.
make img a member of your class.
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Ragnvald Barth
Software engineer

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I'm using Java 1.5.0_06 and Java3D 1.4 (latest "release" build)
Here's some sample code to reproduce the problem:
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I solved this through discussion with phone support.
I swapped my two 30" monitors about.
I connected my primary monitor to the second 7300 card.
I then swapped the 'virtual layout' in monitor prefs so that even if the monitor was connected to card 2 it was set in software to be my primary monitor.
This solved the problem !!

Canvas-problems

at my home pc i can get the canvas to draw a graph,
but when i compile and run this exact same java-file at my laptop
i only see a flash of my graph and
then it just gets white and this isn't the background.

im sorry
it is the background, but it doesnt fix the problem.
I cant get the canvas to stay visible

JMenu is behind Canvas. problem ?

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