QPalette and stylesheet

[Zalwou06]

Hi all

I was wondering if there is any way to retrieve colors set by the stylesheet for different states of a listview item.
I am developing listviews and use an item delegate to paint my items.
Then I need to use brushes to paint the items according to their states and I wanted to retrieve the color set by my css file dynamically without having to use hard coded colors.

Any suggestions ?

thanks

---

Added after 14 minutes:

here is the css for the listview items

/* ----------------------------------------------------------------------------*/
/* QListView */

QListView
{
margin: 0px;
border: 0px;
padding: 0px;
background-color: none;
}

/* NORMAL STATE */
QListView::item
{
margin: 0px;
border: 0px;
padding: 0px;
background-color: rgb(249, 249, 246);
}

/* SELECTED STATE */
QListView::item:selected
{
background-color: rgb(235, 235, 234);
}

/* FOCUSED (or selected) STATE */
QListView::item:focus
{
background-color: rgb(235, 235, 234);
}

/* FOCUSED but hovering over STATE */
QListView::item:focus:hover
{
background-color: rgb(234, 234, 233);
}

/* SELECTED but hovering over STATE */
QListView::item:selected:hover
{
background-color: rgb(234, 234, 233);
}

/* HOVER only STATE */
QListView::item:hover
{
background-color: rgb(245, 245, 242);
}

[tferreira]

This is how I usually do it. You must set a Q_PROPERTY for each property you want, and then get those values in the delegate.

Your custom QListView class would be something like this:

class MyListView : public QListView
{
    Q_OBJECT
    // Color properties
    Q_PROPERTY(QColor normalItemColor            READ normalItemColor            WRITE setNormalItemColor)
    Q_PROPERTY(QColor selectedItemColor            READ selectedItemColor            WRITE setSelectedItemColor)
 
public:
    MyListView(QWidget *parent = 0);
 
public:
    void setNormalItemColor(const QColor &normalItemColor) { m_normalItemColor = normalItemColor; }
    QColor normalItemColor() { return m_normalItemColor; }
 
    void setSelectedItemColor(const QColor &selectedItemColor) { m_selectedItemColor = selectedItemColor; }
    QColor selectedItemColor() { return m_selectedItemColor; }
 
private:
    QColor m_normalItemColor;
    QColor m_selectedItemColor;
}

class MyListView : public QListView
{
    Q_OBJECT
    // Color properties
    Q_PROPERTY(QColor normalItemColor            READ normalItemColor            WRITE setNormalItemColor)
    Q_PROPERTY(QColor selectedItemColor            READ selectedItemColor            WRITE setSelectedItemColor)

public:
    MyListView(QWidget *parent = 0);

public:
    void setNormalItemColor(const QColor &normalItemColor) { m_normalItemColor = normalItemColor; }
    QColor normalItemColor() { return m_normalItemColor; }

    void setSelectedItemColor(const QColor &selectedItemColor) { m_selectedItemColor = selectedItemColor; }
    QColor selectedItemColor() { return m_selectedItemColor; }

private:
    QColor m_normalItemColor;
    QColor m_selectedItemColor;
}

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Then, the MyListView stylesheet would be something like:

QListView {
    qproperty-normalItemColor: #6C6F70;
    qproperty-selectedItemColor: #C2C2C2;
}

QListView {
    qproperty-normalItemColor: #6C6F70;
    qproperty-selectedItemColor: #C2C2C2;
}

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Of course you must pass the MyListView object to the delegate and then get the property values on the paintEvent().

You can read more about properties here: http://qt-project.org/doc/qt-4.8/properties.html
I hope this helps.

[Zalwou06]

Thanks

that could be a solution but I am using QuiLoader to load external UI files so I cannot load custom widgets.
I could override QuiLoader and create the appropriate custom widget but I do not want to.

I am searching for another solution to avoid using hard coded colors in my delegate and I am stiill searching in the Qt code how the css is read and how widgets are using these values...

thanks anyway for you cool solution.

[whawk640]

You can retrieve colors in code that were set in the stylesheet, however I don't think you can do it in the constructor as the style sheet may not have been read yet.

I have been capturing them in the showEvent:

Example:

class MyWidget: public QWidget
{
Q_OBJECT
 
public:
  MyWidget(QWidget* par);
 
protected:
  void showEvent(QShowEvent* evt);
 
private:
  QColor fgColor;
  QColor bgColor;
  QColor altBGColor;
}
 
void MyWidget::showEvent(QShowEvent* evt)
{
  static bool first = true; // Prevent constant re-querying
  if (first)
  {
    QPalette pal = palette();
    fgColor = pal.color(QPalette::Active, QPalette::Text); // color in stylesheet
    bgColor = pal.color(QPalette::Active, QPalette::Window); // background-color in stylesheet
    altBGColor = pal.color(QPalette::Active, QPalette::AlternateBase); //alternate-background-color in stylesheet
    // NOTE: Highlighted foreground and background are also available
    first = false;
  }
  // ...
}

class MyWidget: public QWidget
{
Q_OBJECT

public:
  MyWidget(QWidget* par);

protected:
  void showEvent(QShowEvent* evt);

private:
  QColor fgColor;
  QColor bgColor;
  QColor altBGColor;
}

void MyWidget::showEvent(QShowEvent* evt)
{
  static bool first = true; // Prevent constant re-querying
  if (first)
  {
    QPalette pal = palette();
    fgColor = pal.color(QPalette::Active, QPalette::Text); // color in stylesheet
    bgColor = pal.color(QPalette::Active, QPalette::Window); // background-color in stylesheet
    altBGColor = pal.color(QPalette::Active, QPalette::AlternateBase); //alternate-background-color in stylesheet
    // NOTE: Highlighted foreground and background are also available
    first = false;
  }
  // ...
}

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That's it... Your style Sheet might look like this for MyWidget:

MyWidget
{
  color: #ffffff;
  background-color: #000000;
  alternate-background-color: #200000;
}

MyWidget
{
  color: #ffffff;
  background-color: #000000;
  alternate-background-color: #200000;
}

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I hope this helps.