QT3: mouseover effect in QListViewItem

[karye]

Nice!
But I need mouseOut also, or repaint all with triggerUpdate() maybe?

[wysota]

onItem will surely return a null pointer if you leave the view. You can act on it then by making sure none of the items are highlighted.

Something like that should (more or less) work:

class MyListView : public QListView {
Q_OBJECT
public:
  MyListView ( QWidget * parent = 0, const char * name = 0, WFlags f = 0 );
private:
  QListViewItem *_highlighted;
protected:
  void drawContentsOffset ( QPainter * p, int ox, int oy, int cx, int cy, int cw, int ch );
private slots:
  void highlightItem(QListViewItem *);
}
 
MyListView ( QWidget * parent, const char * name, WFlags f) : QListView ( parent, name, f ) { 
  _highlighted = 0; 
  connect(this, SIGNAL(onItem(QListViewItem*)), this, SLOT(highlightitem(QListViewItem*)));
}
 
void MyListView::highlightItem(QListViewItem *item){
  _highlighted = item;
  updateContents();
}
 
void MyListView::drawContentsOffset ( QPainter * p, int ox, int oy, int cx, int cy, int cw, int ch ){
  // reimplement from QListView (for example copy & paste)
  // there should be some loop there which iterates over items
  // I assume that 'item' is a pointer to an item currently drawn
 
 
    QColorGroup cg = //... 
    QColorGroup storecg = cg;
    if(item==_highlighted){
    cg.setColor(QColorGroup::Base, QColor(255,255,0)); // could be Background not Base
    }
    // do some stuff here probably
    // eventually there will be a call like so:
    item->paintCell(p, cg, ...);
    // then you can restore the background
    if(item==_highlighted){
        cg = storecg;
    }
    // ...
}

class MyListView : public QListView {
Q_OBJECT
public:
  MyListView ( QWidget * parent = 0, const char * name = 0, WFlags f = 0 );
private:
  QListViewItem *_highlighted;
protected:
  void drawContentsOffset ( QPainter * p, int ox, int oy, int cx, int cy, int cw, int ch );
private slots:
  void highlightItem(QListViewItem *);
}

MyListView ( QWidget * parent, const char * name, WFlags f) : QListView ( parent, name, f ) { 
  _highlighted = 0; 
  connect(this, SIGNAL(onItem(QListViewItem*)), this, SLOT(highlightitem(QListViewItem*)));
}

void MyListView::highlightItem(QListViewItem *item){
  _highlighted = item;
  updateContents();
}

void MyListView::drawContentsOffset ( QPainter * p, int ox, int oy, int cx, int cy, int cw, int ch ){
  // reimplement from QListView (for example copy & paste)
  // there should be some loop there which iterates over items
  // I assume that 'item' is a pointer to an item currently drawn
  
    
    QColorGroup cg = //... 
    QColorGroup storecg = cg;
    if(item==_highlighted){
    cg.setColor(QColorGroup::Base, QColor(255,255,0)); // could be Background not Base
    }
    // do some stuff here probably
    // eventually there will be a call like so:
    item->paintCell(p, cg, ...);
    // then you can restore the background
    if(item==_highlighted){
        cg = storecg;
    }
    // ...
}

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Just make sure that when an item is deleted, it doesn't segfault on the _highlighted pointer (it should be ok if the code looks like the one above).