Layout issue

[SPlatten]

This is the UI:

<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
<class>MainWindow</class>
<widget class="QMainWindow" name="MainWindow">
  <property name="geometry">
   <rect>
    <x>0</x>
    <y>0</y>
    <width>567</width>
    <height>492</height>
   </rect>
  </property>
  <property name="sizePolicy">
   <sizepolicy hsizetype="Expanding" vsizetype="Expanding">
    <horstretch>0</horstretch>
    <verstretch>0</verstretch>
   </sizepolicy>
  </property>
  <property name="windowTitle">
   <string>Trainer Server</string>
  </property>
  <widget class="QWidget" name="centralWidget">
   <property name="sizePolicy">
    <sizepolicy hsizetype="Expanding" vsizetype="Expanding">
     <horstretch>0</horstretch>
     <verstretch>0</verstretch>
    </sizepolicy>
   </property>
   <layout class="QGridLayout" name="gridLayout">
    <item row="0" column="0" colspan="4">
     <layout class="QHBoxLayout" name="phszloTop">
      <item>
       <widget class="QPushButton" name="pbtnAdmin">
        <property name="sizePolicy">
         <sizepolicy hsizetype="Minimum" vsizetype="Fixed">
          <horstretch>0</horstretch>
          <verstretch>0</verstretch>
         </sizepolicy>
        </property>
        <property name="font">
         <font>
          <pointsize>9</pointsize>
         </font>
        </property>
        <property name="contextMenuPolicy">
         <enum>Qt::NoContextMenu</enum>
        </property>
        <property name="text">
         <string>&amp;Admin...</string>
        </property>
       </widget>
      </item>
      <item>
       <widget class="QPushButton" name="pbtnSearch">
        <property name="sizePolicy">
         <sizepolicy hsizetype="Minimum" vsizetype="Fixed">
          <horstretch>0</horstretch>
          <verstretch>0</verstretch>
         </sizepolicy>
        </property>
        <property name="font">
         <font>
          <pointsize>9</pointsize>
         </font>
        </property>
        <property name="contextMenuPolicy">
         <enum>Qt::NoContextMenu</enum>
        </property>
        <property name="text">
         <string>&amp;Search...</string>
        </property>
       </widget>
      </item>
      <item>
       <widget class="QPushButton" name="pbtnBeginSession">
        <property name="sizePolicy">
         <sizepolicy hsizetype="Minimum" vsizetype="Fixed">
          <horstretch>0</horstretch>
          <verstretch>0</verstretch>
         </sizepolicy>
        </property>
        <property name="font">
         <font>
          <pointsize>9</pointsize>
         </font>
        </property>
        <property name="contextMenuPolicy">
         <enum>Qt::NoContextMenu</enum>
        </property>
        <property name="text">
         <string>&amp;Begin Session</string>
        </property>
       </widget>
      </item>
      <item>
       <widget class="QPushButton" name="pbtnEndSession">
        <property name="sizePolicy">
         <sizepolicy hsizetype="Minimum" vsizetype="Fixed">
          <horstretch>0</horstretch>
          <verstretch>0</verstretch>
         </sizepolicy>
        </property>
        <property name="font">
         <font>
          <pointsize>9</pointsize>
         </font>
        </property>
        <property name="contextMenuPolicy">
         <enum>Qt::NoContextMenu</enum>
        </property>
        <property name="text">
         <string>&amp;End Session</string>
        </property>
       </widget>
      </item>
      <item>
       <widget class="QLabel" name="lblTtoV">
        <property name="sizePolicy">
         <sizepolicy hsizetype="Fixed" vsizetype="Preferred">
          <horstretch>0</horstretch>
          <verstretch>0</verstretch>
         </sizepolicy>
        </property>
        <property name="layoutDirection">
         <enum>Qt::LeftToRight</enum>
        </property>
        <property name="text">
         <string>Select Trainee to View:</string>
        </property>
        <property name="alignment">
         <set>Qt::AlignRight|Qt::AlignTrailing|Qt::AlignVCenter</set>
        </property>
       </widget>
      </item>
      <item>
       <widget class="QComboBox" name="cboTraineeToView">
        <property name="sizePolicy">
         <sizepolicy hsizetype="Minimum" vsizetype="Fixed">
          <horstretch>0</horstretch>
          <verstretch>0</verstretch>
         </sizepolicy>
        </property>
       </widget>
      </item>
     </layout>
    </item>
    <item row="1" column="0" colspan="4">
     <layout class="QGridLayout" name="pgrdloContent">
      <property name="leftMargin">
       <number>6</number>
      </property>
      <property name="topMargin">
       <number>6</number>
      </property>
      <property name="rightMargin">
       <number>6</number>
      </property>
      <property name="bottomMargin">
       <number>6</number>
      </property>
     </layout>
    </item>
   </layout>
  </widget>
</widget>
<layoutdefault spacing="6" margin="11"/>
<resources/>
<connections/>
</ui>

And this is what it looks like in the application:

The labels Ground Truth and Trainee Marks are setup in the same QGridLayout as the widgets below:

    QLabel* plblGroundTruths = new QLabel("Ground Truth", this);
    plblGroundTruths->setStyleSheet("font-weight: bold;");
    plblGroundTruths->setAlignment(Qt::AlignHCenter);
    truth* pGroundTruth = new truth(this);
    QLabel* plblTraineeMarks = new QLabel("Trainee Marks", this);
    plblTraineeMarks->setStyleSheet("font-weight: bold;");
    plblTraineeMarks->setAlignment(Qt::AlignHCenter);
    truth* pTraineeMarks = new truth(this);   
    //Remove widgets from layout
    removeContent(mpui->pgrdloContent);
    //Add the content to the layout
    mpui->pgrdloContent->addWidget(plblGroundTruths, 0, 1);
    mpui->pgrdloContent->addWidget(plblTraineeMarks, 0, 2);
    mpui->pgrdloContent->addLayout(pfrmloMain, 1, 0);
    mpui->pgrdloContent->addWidget(pGroundTruth, 1, 1);
    mpui->pgrdloContent->addWidget(pTraineeMarks, 1, 2);

However for some reason which escapes me, there is a gap between the labels and the widgets below them when I resize the window, the gap gets bigger, why?

[Edit] I've modified the lines:

    plblGroundTruths->setAlignment(Qt::AlignHCenter | Qt::AlignBottom);
    plblTraineeMarks->setAlignment(Qt::AlignHCenter | Qt::AlignBottom);

Now there is no gap between the labels and the widgets underneath, now the gap is above the labels and if I resize the window the gap increases in size, what is missing?

[Edit 2] I've added a verticalSpacer under the QGridLayout and now there is no gap, but the vertical size of the QGridLayout does not adjust to the size of the window vertically ?

[JonB]

@SPlatten
My last attempt, because I'm going out, and someone who knows designer better than me can doubtless say.

The stretch needs to be set on the layout items added to the enclosing vboxlayout. That (the vboxlayout) has stretch factors doesn't it, or not? Temporarily put a stretch of 1 for its first first item, the hbox, and a stretch of 100 for its second item, the gridlayout? That's probably not fully right but does it do what you want? Else I don't know which way to do it.

[Pl45m4]

@SPlatten

I don't know, if it's just me but I'm personally not a big fan of QGridLayouts. I would use cascading HBox + VBox Layouts in 99% of the cases.

As I can tell from your picture, you have the same (or similar) issues, you had with your "Select Trainee" label, inside your Alarms GroupBox. The words "error" and "temperatur" are not shown completely.

@SPlatten said in Layout issue:

but the vertical size of the QGridLayout does not adjust to the size of the window vertically ?

Because the Grid shares the expansion of width and/or height with all elements in the grid (depending on your size policies and size hints). So, I guess, it's because of the space the two labels above the two black boxes take.

Edit:

@SPlatten said in Layout issue:

[Edit 2] I've added a verticalSpacer under the QGridLayout and now there is no gap

In addition: The spacer "swallows" your movement in vertical direction. The spacer keeps getting bigger and pushes the widgets above him further to the top.

[SPlatten]

@Pl45m4 , thank you I will investigate.

[SPlatten]

@Pl45m4 , still an issue, the initial layout:

After dragging out the top:

What I want to happen is for the bottom layout to stay joined to just under the horizontal layout where the buttons are, so it expands. So far everything I've tried has failed. The top layout that contains the button and the combo is QHBoxLayout, the layout that contains everything else under the horizontal layout is a QGridLayout.

Dragging out horizontally is not a problem and everything works beautifully, its just vertical where the QGridLayout does not resize.

[SPlatten]

@SPlatten , bump, can anyone help?

[SPlatten]

@SPlatten , Is this achievable?

[JonB]

@SPlatten
Presumably you actually mean that the whole widget has a QVBoxLayout, containing a QHBoxLayout for the button row and a QGridLayout for the bottom stuff. If, as I understand it, you want to resize the outer widget vertically and have the QGridLayout area remain near the top, don't you just want a stretch after the grid layout?

[SPlatten]

@JonB , looking at the ui file the structure is:

MainWindow            QMainWindow
  phzloTop            QHBoxLayout
    cboTraineeToView  QComboBox
    lblTtoV           QLabel
    pbtnAdmin         QPushButton
    pbtnBeginSession  QPushButton
    pbtnEndSession    QPushButton
    pbtnSearch        QPushButton
  pgrdloContent       QGridLayout

The widgets that appear in the QGridLayout are define in a database and added to the layout at runtime. There are various instances of QVBoxLayout and QFormLayout used to layout the data on the left of the grid.

[JonB]

@SPlatten
I don't really understand how the main window has a QHBoxLayout followed by a QGridLayout without being enclosed in a QVBoxLayout, and how you achieved it in the designer. What makes the QGridLayout come below the QHBoxLayout rather than, say, to the right of it?

In any case, if I understand what you want correctly, I would have done:

QVBoxLayout
    QHBoxLayout
    QGridLayout
    addStretch()

But maybe I'm wrong or don't understand.

[SPlatten]

@JonB, thank you, I'll give it a try.

[SPlatten]

@JonB , I've added a QVBoxLayout at top level in the centralWidget, I've then dragged and dropped the QHBoxLayout and QGridLayout into this, I've edited the properties for the QVBoxLayout setting layoutStretch to 1,1.

Unfortunately its still the same as it was before adding the QVBoxLayout where horizontally everything is great, but vertically the button bar moves with the top of the window but the QGridLayout does not.

Also in code for the QGridLayout after I have populated it:

mpui->pgrdloContent->setRowStretch(0, 1);
mpui->pgrdloContent->setRowStretch(1, 1);

[JonB]

@SPlatten said in Layout issue:

I've edited the properties for the QVBoxLayout setting layoutStretch to 1,1.

But that makes them have the same stretch as each other, exactly as they do and you don't want. I said to add a stretch after the QGridLayout as per what I wrote, that's the whole point?

[SPlatten]

@JonB , Either we have crossed over or I'm not understanding what you are saying I've added a stretch to the QGridLayout, isn't that exactly what this does?:

mpui->pgrdloContent->setRowStretch(0, 1);
mpui->pgrdloContent->setRowStretch(1, 1);

[JonB]

@SPlatten
No. Exactly as I wrote. 3 things: a horizontal layout, then a grid layout, then a stretch.

Why don't you practice with just a vertical layout containing two horizontal layouts and a stretch? That's what you want, right? I can't see how the grid layout being a grid is relevant.

[SPlatten]

@JonB , I have:

MainWindow              QMainWindow
  pvtloMain             QVBoxLayout
    phzloTop            QHBoxLayout
      cboTraineeToView  QComboBox
      lblTtoV           QLabel
      pbtnAdmin         QPushButton
      pbtnBeginSession  QPushButton
      pbtnEndSession    QPushButton
      pbtnSearch        QPushButton
    pgrdloContent       QGridLayout

[JonB]

@SPlatten
I have already answered this 3 times. I said you need a stretch after the grid layout, assuming I understand what you want. I can't say it any more.

[SPlatten]

@JonB, what is a stretch? I don't see it in the side bar, under which group should I find that?

[JonB]

@SPlatten
I don't run Designer but it's there on the toolbar. Horizontal & vertical stretchers. They look like blue stretches when you place them. They should end up generating

vertLayout.addStretch()

I think/assume. void QBoxLayout::addStretch(int stretch = 0).

[Pl45m4]

@JonB

Spacers not stretch :)
Stretch is the stretch factor to stretch a layout item over multiple layout "slots"

[JonB]

@Pl45m4
I have written what I thought it was. I thought spacers were fixed size. Anyway whichever you say! It's some blue thing in Designer :) The link I gave for addStretch() states:

Adds a stretchable space (a QSpacerItem) with zero minimum size and stretch factor stretch to the end of this box layout.

Isn't that it?