Hi,
On the weekend I tried to write some custom layouts to match layouts I
already know from SWT but I'm somehow failing miserably.
Problem 1: The time of setting the layout to a QWidget
======================================================
----------8<----------
QWidget center = new QWidget();
setCentralWidget(center);
QTFillLayout layout = new QTFillLayout();
center.setLayout(layout);
QWidget widget = new QWidget();
layout.addWidget(widget,"");
QTFillLayout layout2 = new QTFillLayout();
widget.setLayout(layout2);
QLabel label = new QLabel();
label.setText("BlaBla");
layout2.addWidget(label, "");
QPushButton button = new QPushButton();
button.setText("B1");
layout2.addWidget(button,"");
----------8<----------
Renderes an empty window but when I rearrange the setting of the layout
like this:
----------8<----------
QWidget center = new QWidget();
setCentralWidget(center);
QTFillLayout layout = new QTFillLayout();
QWidget widget = new QWidget();
layout.addWidget(widget,"");
QTFillLayout layout2 = new QTFillLayout();
widget.setLayout(layout2);
QLabel label = new QLabel();
label.setText("BlaBla");
layout2.addWidget(label, "");
QPushButton button = new QPushButton();
button.setText("B1");
layout2.addWidget(button,"");
layout.addWidget(widget,"");
center.setLayout(layout);
----------8<----------
The layout works.
Problem 2: Using layout#addWidget(QWidget)
==========================================
Fragment 1 from above gives:
"Invalid memory access of location 00000000 eip=08d15e36"
Fragment 2 from above gives:
> QtJambi: Exception pending in native code
> Exception in thread "main" com.trolltech.qt.QNoNativeResourcesException:
> Function call on incomplete object of type:
> com.trolltech.qt.gui.QLayoutItem$ConcreteWrapper
> at
> com.trolltech.qt.gui.QLayoutItem$ConcreteWrapper.sizeHint(QLayoutItem.java:70)
> at
> org.ufacekit.ui.qt.core.layouts.QTFillLayout.sizeHint(QTFillLayout.java:78)
> at com.trolltech.qt.gui.QWidget.__qt_show(Native Method)
> at com.trolltech.qt.gui.QWidget.show(QWidget.java:2134)
> at
> org.ufacekit.ui.qt.example.TestFillLayout.main(TestFillLayout.java:39)
> QtJambi: Exception pending in native code
> Exception in thread "main" com.trolltech.qt.QNoNativeResourcesException:
> Function call on incomplete object of type:
> com.trolltech.qt.gui.QLayoutItem$ConcreteWrapper
> at
> com.trolltech.qt.gui.QLayoutItem$ConcreteWrapper.setGeometry(QLayoutItem.java:62)
> at
> org.ufacekit.ui.qt.core.layouts.QTFillLayout.setGeometry(QTFillLayout.java:68)
> at com.trolltech.qt.gui.QWidget.__qt_show(Native Method)
> at com.trolltech.qt.gui.QWidget.show(QWidget.java:2134)
> at
> org.ufacekit.ui.qt.example.TestFillLayout.main(TestFillLayout.java:39)
> QtJambi: Exception pending in native code
> Exception in thread "main" com.trolltech.qt.QNoNativeResourcesException:
> Function call on incomplete object of type:
> com.trolltech.qt.gui.QLayoutItem$ConcreteWrapper
> at
> com.trolltech.qt.gui.QLayoutItem$ConcreteWrapper.setGeometry(QLayoutItem.java:62)
> at
> org.ufacekit.ui.qt.core.layouts.QTFillLayout.setGeometry(QTFillLayout.java:68)
> at com.trolltech.qt.gui.QWidget.__qt_show(Native Method)
> at com.trolltech.qt.gui.QWidget.show(QWidget.java:2134)
> at
> org.ufacekit.ui.qt.example.TestFillLayout.main(TestFillLayout.java:39)
> QtJambi: Exception pending in native code
> Exception in thread "main" com.trolltech.qt.QNoNativeResourcesException:
> Function call on incomplete object of type:
> com.trolltech.qt.gui.QLayoutItem$ConcreteWrapper
> at
> com.trolltech.qt.gui.QLayoutItem$ConcreteWrapper.setGeometry(QLayoutItem.java:62)
> at
> org.ufacekit.ui.qt.core.layouts.QTFillLayout.setGeometry(QTFillLayout.java:68)
> at com.trolltech.qt.gui.QWidget.__qt_show(Native Method)
> at com.trolltech.qt.gui.QWidget.show(QWidget.java:2134)
> at
> org.ufacekit.ui.qt.example.TestFillLayout.main(TestFillLayout.java:39)
> QtJambi: Exception pending in native code
> Exception in thread "main" com.trolltech.qt.QNoNativeResourcesException:
> Function call on incomplete object of type:
> com.trolltech.qt.gui.QLayoutItem$ConcreteWrapper
> at
> com.trolltech.qt.gui.QLayoutItem$ConcreteWrapper.setGeometry(QLayoutItem.java:62)
> at
> org.ufacekit.ui.qt.core.layouts.QTFillLayout.setGeometry(QTFillLayout.java:68)
> at com.trolltech.qt.gui.QWidget.__qt_show(Native Method)
> at com.trolltech.qt.gui.QWidget.show(QWidget.java:2134)
> at
> org.ufacekit.ui.qt.example.TestFillLayout.main(TestFillLayout.java:39)
> QtJambi: Exception pending in native code
> Exception in thread "main" com.trolltech.qt.QNoNativeResourcesException:
> Function call on incomplete object of type:
> com.trolltech.qt.gui.QLayoutItem$ConcreteWrapper
> at
> com.trolltech.qt.gui.QLayoutItem$ConcreteWrapper.sizeHint(QLayoutItem.java:70)
> at
> org.ufacekit.ui.qt.core.layouts.QTFillLayout.sizeHint(QTFillLayout.java:78)
> at com.trolltech.qt.gui.QApplication.exec(Native Method)
> at
> org.ufacekit.ui.qt.example.TestFillLayout.main(TestFillLayout.java:40)
> QtJambi: Exception pending in native code
> Exception in thread "main" com.trolltech.qt.QNoNativeResourcesException:
> Function call on incomplete object of type:
> com.trolltech.qt.gui.QLayoutItem$ConcreteWrapper
> at
> com.trolltech.qt.gui.QLayoutItem$ConcreteWrapper.setGeometry(QLayoutItem.java:62)
> at
> org.ufacekit.ui.qt.core.layouts.QTFillLayout.setGeometry(QTFillLayout.java:68)
> at com.trolltech.qt.gui.QApplication.exec(Native Method)
> at
> org.ufacekit.ui.qt.example.TestFillLayout.main(TestFillLayout.java:40)
> QtJambi: Exception pending in native code
> Exception in thread "main" com.trolltech.qt.QNoNativeResourcesException:
> Function call on incomplete object of type:
> com.trolltech.qt.gui.QLayoutItem$ConcreteWrapper
> at
> com.trolltech.qt.gui.QLayoutItem$ConcreteWrapper.sizeHint(QLayoutItem.java:70)
> at
> org.ufacekit.ui.qt.core.layouts.QTFillLayout.sizeHint(QTFillLayout.java:78)
> at com.trolltech.qt.gui.QApplication.exec(Native Method)
> at
> org.ufacekit.ui.qt.example.TestFillLayout.main(TestFillLayout.java:40)
The example i used is
http://doc.trolltech.com/4.4/layouts-borderlayout.html, I don't know C++
but I think I translated this appropriately into Java.
Tom
/*******************************************************************************
* Copyright (c) 2008, Original authors.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Tom Schindl <[EMAIL PROTECTED]>
*******************************************************************************/
package org.ufacekit.ui.qt.core.layouts;
import java.util.ArrayList;
import java.util.List;
import com.trolltech.qt.core.QRect;
import com.trolltech.qt.core.QSize;
import com.trolltech.qt.gui.QLayout;
import com.trolltech.qt.gui.QLayoutItemInterface;
import com.trolltech.qt.gui.QWidget;
import com.trolltech.qt.gui.QWidgetItem;
public class QTFillLayout extends QLayout {
private List<ItemWrapper> items = new ArrayList<ItemWrapper>();
private class ItemWrapper {
private QLayoutItemInterface item;
public ItemWrapper(QLayoutItemInterface item) {
this.item = item;
}
}
@Override
public void addItem(QLayoutItemInterface arg0) {
items.add(new ItemWrapper(arg0));
}
public void addWidget(QWidget widget, String a) {
items.add(new ItemWrapper(new QWidgetItem(widget)));
}
@Override
public int count() {
return items.size();
}
@Override
public QLayoutItemInterface itemAt(int arg0) {
if( arg0 < items.size() ) {
return items.get(arg0).item;
}
return null;
}
@Override
public void setGeometry(QRect geometry) {
super.setGeometry(geometry);
if( items.size() == 0 ) {
return;
}
int width = geometry.width() / items.size();
int height = geometry.height();
int x = 0;
for (ItemWrapper i: items) {
i.item.setGeometry(new QRect(x, 0, width, height));
x += width;
}
}
@Override
public QSize sizeHint() {
QSize size = new QSize();
for( ItemWrapper i: items ) {
size.setWidth(size.width()+ i.item.sizeHint().width());
int height = i.item.sizeHint().height();
if (size.height() < height) {
size.setHeight(height);
}
}
return size;
}
@Override
public QLayoutItemInterface takeAt(int arg0) {
return items.remove(arg0).item;
}
}
package org.ufacekit.ui.qt.example;
import org.ufacekit.ui.qt.core.layouts.QTFillLayout;
import org.ufacekit.ui.qt.core.layouts.QTGridData;
import org.ufacekit.ui.qt.core.layouts.QTGridLayout;
import com.trolltech.qt.gui.QApplication;
import com.trolltech.qt.gui.QLabel;
import com.trolltech.qt.gui.QMainWindow;
import com.trolltech.qt.gui.QPushButton;
import com.trolltech.qt.gui.QWidget;
public class TestFillLayout extends QMainWindow {
public TestFillLayout() {
QWidget center = new QWidget();
setCentralWidget(center);
QTFillLayout layout = new QTFillLayout();
center.setLayout(layout);
QWidget widget = new QWidget();
layout.addWidget(widget);
QTFillLayout layout2 = new QTFillLayout();
widget.setLayout(layout2);
QLabel label = new QLabel();
label.setText("BlaBla");
layout2.addWidget(label);
QPushButton button = new QPushButton();
button.setText("B1");
layout2.addWidget(button);
}
public static void main(final String[] args) {
try {
QApplication.initialize(args);
new TestFillLayout().show();
QApplication.exec();
} catch(Exception e) {
e.printStackTrace();
}
}
}_______________________________________________
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