[SOLVED] How can i know what animations QPropertyAnimation can do?

andre

Yes, those corrections are correct. I just quickly typed into the forum editor.

Silly question, but is ui->clock_label actually of the new class you created?

Leon

I am kinda rookie on adding a class beside the MainWindow's one so its a bit confusing for me..

This is my .h file
@#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include "QPropertyAnimation"
#include "QLabel"

namespace Ui {
class MainWindow;
class Label;
}

class MainWindow : public QMainWindow
{
Q_OBJECT

public:
explicit MainWindow(QWidget *parent = 0);
~MainWindow();

private:
Ui::MainWindow *ui;
QPropertyAnimation *animation;
};

class Label: public QLabel {
Q_OBJECT
Q_PROPERTY (double fontPointSize READ fontPointSize WRITE setFontPointSize)

public:
Label(QWidget* parent = 0): QLabel(parent) {}
double fontPointSize() const {return font().pointSizeF();}
Q_SLOT void setFontPointSize(double size) {QFont f = font(); f.setPointSizeF(size); setFont(f);}

private slots:
void on_clock_label_linkActivated();
};

#endif // MAINWINDOW_H@

And at my mainwindow.cpp i have this function:
@void Label::on_clock_label_linkActivated()
{

QPropertyAnimation *animation = new QPropertyAnimation(ui->clock_label, "setFontPointSize");
animation->setDuration(5000);
animation->setStartValue(10);
animation->setEndValue(60);

animation->start();

}@

The text of the label (label added by qt designer):
@<html><head/><body><p><a href="“textPassedToLinkActivatedSignal”"><span >text</span></a></p></body></html>@

How can i when the user clicks the label run the void on_clock_label_linkActivated(); ?
I mean it gives the error of ui not being declared..

andre

I think that in your .ui file, you are still using a standard label.

Split off your Label code into a set of files of its own: label.h and label.cpp. Then in your .ui file, right click on the label, and use the promote to... option so you can use your own Label instead of QLabel.

Leon

Have never used promote either.. Xmm so what i did?
Step 1: Created a clock_label.h and clock_label.cpp file (Via right clicking project->add new->C++ class)
Step 2: Edited .h file code to:
@#ifndef CLOCK_LABEL_H
#define CLOCK_LABEL_H

#include "QLabel"

class clock_label
{
Q_OBJECT
Q_PROPERTY (double fontPointSize READ fontPointSize WRITE setFontPointSize)

public:
clock_label();
Label(QWidget* parent = 0): QLabel(parent) {}
double fontPointSize() const {return font().pointSizeF();}
Q_SLOT void setFontPointSize(double size) {QFont f = font(); f.setPointSizeF(size); setFont(f);}
};

#endif // CLOCK_LABEL_H@
Step 3:Went at the designer right clicked the label->promote to
In promoted class name i putted clock_label, then i clicked add and then promote
And i can see in the designer it now shows clock_label instead of QLabel.

But now i have errors like
error: ISO C++ forbids declaration of 'Label' with no type [-fpermissive]
error: type 'QLabel' is not a direct base of 'clock_label'

what i did wrong at the .h file?

andre

Your clock_label doesn't derive from QLabel...

Leon

That being said, can u point me out in what step have i done something wrong?

andre

Compare line 6 of the code that you just posted with line 1 of the sample I posted earlier...

Leon

You are right,
thank you and i appreciate your time ;)

Leon

I really don't get how i should subclass the property..

for example Andre's code
@ Q_PROPERTY (double fontPointSize READ fontPointSize WRITE setFontPointSize)
double fontPointSize() const {return font().pointSizeF();}
Q_SLOT void setFontPointSize(double size) {QFont f = font();@

how to change this code to work for the minimumwidth?

@ Q_PROPERTY (double minimumWidth READ minimumWidth WRITE setMinimumWidth)
double minimumWidth() const {return minimumWidth();}
Q_SLOT void setMinimumWidth(double size) {setMinimumWidth(size);}@

Why isn't the above code working but instead it freezes the application...

andre

Why would you want this, since minimumWidth is already a property?

Leon

You are right it works if i dont subclass it..
Ok now i understand.. i should have gone here "QWidget Class Reference":http://doc.qt.digia.com/qt/qwidget.html and check if minimumwidth is a property..

Well i was looking at QLabel's class reference and that's why i got confused...
thanks again ;)