child window with very small size !!!

[qlands]

Hi,

I have a midi application that create child windows holding a widget

The problem is that the child windows is always created with the minimum size!



When it should be something like:




I am loading the child with:

documentWindow *child = createMdiChild();
    countries *cnt = new countries(this,database);
    child->setCentralWidget(cnt);
    child->show();
    child->setWindowTitle("Countries Maintenance");

documentWindow *child = createMdiChild();
    countries *cnt = new countries(this,database);
    child->setCentralWidget(cnt);
    child->show();
    child->setWindowTitle("Countries Maintenance");

To copy to clipboard, switch view to plain text mode 

documentWindow *MainWindow::createMdiChild()
{
    documentWindow *child = new documentWindow;
    mdiArea->addSubWindow(child);
    return child;
}

documentWindow *MainWindow::createMdiChild()
{
    documentWindow *child = new documentWindow;
    mdiArea->addSubWindow(child);
    return child;
}

To copy to clipboard, switch view to plain text mode 

The centralWidget cnt has the size w=508 h=250. Its size policy is fixed.

Any idea how to correct this so the size of the child matched the size of the centralWidget?

Thanks!!!

[mcosta]

Two questions:

1. Do you use Layouts in child widgets?
2. Do you set the size policy of child widgets?

[qlands]

Do you use Layouts in child widgets?
No.

Do you set the size policy of child widgets?
Yes. Is fixed.

I also tried to have a main layout in the child window and insert the child widget to the layout but I get the same problem

[mcosta]

It's strange.
Can you post your code/form ?

[qlands]

Hi,

Here are the files:

The UI window that holds the child widget:

<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
 <class>documentWindow</class>
 <widget class="QMainWindow" name="documentWindow">
  <property name="geometry">
   <rect>
    <x>0</x>
    <y>0</y>
    <width>517</width>
    <height>300</height>
   </rect>
  </property>
  <property name="sizePolicy">
   <sizepolicy hsizetype="Expanding" vsizetype="Expanding">
    <horstretch>0</horstretch>
    <verstretch>0</verstretch>
   </sizepolicy>
  </property>
  <property name="windowTitle">
   <string>MainWindow</string>
  </property>
  <widget class="QWidget" name="centralwidget"/>
  <widget class="QStatusBar" name="statusbar"/>
 </widget>
 <resources/>
 <connections/>
</ui>

<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
 <class>documentWindow</class>
 <widget class="QMainWindow" name="documentWindow">
  <property name="geometry">
   <rect>
    <x>0</x>
    <y>0</y>
    <width>517</width>
    <height>300</height>
   </rect>
  </property>
  <property name="sizePolicy">
   <sizepolicy hsizetype="Expanding" vsizetype="Expanding">
    <horstretch>0</horstretch>
    <verstretch>0</verstretch>
   </sizepolicy>
  </property>
  <property name="windowTitle">
   <string>MainWindow</string>
  </property>
  <widget class="QWidget" name="centralwidget"/>
  <widget class="QStatusBar" name="statusbar"/>
 </widget>
 <resources/>
 <connections/>
</ui>

To copy to clipboard, switch view to plain text mode 

Abstract of the child widget. I use layouts for some if its widgets but the child widget itself does not have a layout.

See image here:

<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
 <class>countries</class>
 <widget class="QWidget" name="countries">
  <property name="geometry">
   <rect>
    <x>0</x>
    <y>0</y>
    <width>588</width>
    <height>250</height>
   </rect>
  </property>
  <property name="sizePolicy">
   <sizepolicy hsizetype="Fixed" vsizetype="Fixed">
    <horstretch>0</horstretch>
    <verstretch>0</verstretch>
   </sizepolicy>
  </property>
  <property name="toolTip">
   <string/>
  </property>
  <widget class="QLabel" name="Panel2">
   <property name="enabled">
    <bool>true</bool>
   </property>
   <property name="geometry">
    <rect>
     <x>11</x>
     <y>32</y>
     <width>567</width>
     <height>3</height>
    </rect>
   </property>
   <property name="toolTip">
    <string/>
   </property>
   <property name="layoutDirection">
    <enum>Qt::LeftToRight</enum>
   </property>
   <property name="frameShape">
    <enum>QFrame::Panel</enum>
   </property>
   <property name="frameShadow">
    <enum>QFrame::Raised</enum>
   </property>
   <property name="text">
    <string/>
   </property>
   <property name="alignment">
    <set>Qt::AlignCenter</set>
   </property>
  </widget>
  <widget class="QWidget" name="verticalLayoutWidget">
   <property name="geometry">
    <rect>
     <x>16</x>
     <y>48</y>
     <width>300</width>
     <height>180</height>
    </rect>
   </property>
   <layout class="QVBoxLayout" name="verticalLayout">
 
.....

<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
 <class>countries</class>
 <widget class="QWidget" name="countries">
  <property name="geometry">
   <rect>
    <x>0</x>
    <y>0</y>
    <width>588</width>
    <height>250</height>
   </rect>
  </property>
  <property name="sizePolicy">
   <sizepolicy hsizetype="Fixed" vsizetype="Fixed">
    <horstretch>0</horstretch>
    <verstretch>0</verstretch>
   </sizepolicy>
  </property>
  <property name="toolTip">
   <string/>
  </property>
  <widget class="QLabel" name="Panel2">
   <property name="enabled">
    <bool>true</bool>
   </property>
   <property name="geometry">
    <rect>
     <x>11</x>
     <y>32</y>
     <width>567</width>
     <height>3</height>
    </rect>
   </property>
   <property name="toolTip">
    <string/>
   </property>
   <property name="layoutDirection">
    <enum>Qt::LeftToRight</enum>
   </property>
   <property name="frameShape">
    <enum>QFrame::Panel</enum>
   </property>
   <property name="frameShadow">
    <enum>QFrame::Raised</enum>
   </property>
   <property name="text">
    <string/>
   </property>
   <property name="alignment">
    <set>Qt::AlignCenter</set>
   </property>
  </widget>
  <widget class="QWidget" name="verticalLayoutWidget">
   <property name="geometry">
    <rect>
     <x>16</x>
     <y>48</y>
     <width>300</width>
     <height>180</height>
    </rect>
   </property>
   <layout class="QVBoxLayout" name="verticalLayout">
    
.....

To copy to clipboard, switch view to plain text mode 

Thanks.

---

Added after 39 minutes:

Even if I set size max and min to the child item and copying that to the container window. The window starts very small

child->setCentralWidget(cnt);
    child->show();
    child->setGeometry(cnt->geometry());
    child->setMaximumSize(cnt->maximumSize());
    child->setMinimumSize(cnt->minimumSize());

child->setCentralWidget(cnt);
    child->show();
    child->setGeometry(cnt->geometry());
    child->setMaximumSize(cnt->maximumSize());
    child->setMinimumSize(cnt->minimumSize());

To copy to clipboard, switch view to plain text mode 

But when I try to expand it does it automatic to the min size... However there is a refresh error where the content of the tableview does not show properly.

[mcosta]

Have you tried to use layout on the "countries" widget?

[qlands]

Yes I did and I get the same: The window starts very small but when I move it for example, it changes to the proper size... I not even need to resize it.. just move it

For that case I set the layout of the widget to vertical and then organized its items.

[mcosta]

If you don't use Main Layout for a Widget, you should reimplement QWidget::sizeHint() function.

[john_god]

What about:

child->showMaximized();

child->showMaximized();

To copy to clipboard, switch view to plain text mode 

instead of

child->show();

child->show();

To copy to clipboard, switch view to plain text mode 

Note that you should first mess with size and geometry and only then call show()

[qlands]

Yep!..
I had to show it minimized first then set the status to normal.

Very wierd!!!