[Qt-interest] can not set Layout correctly

[Bo Thorsen]

Den 25-08-2010 08:15, yanqzhi at gmail.com skrev:
> *I have a class subclass QDialog*
> 
> class MyDiaolog : public QDialog
> {
> Q_OBJECT
> 
> public:
> MyDiaolog(QWidget *parent = NULL);
> ~MyDiaolog();
> 
> protected:
> QPushButton * mButton;
> QGridLayout * mLayout;
> };
> 
> *in the constructor*
> 
> MyDiaolog::MyDiaolog(QWidget *parent)
> : QDialog(parent)
> {
> mButton = new QPushButton("testButton", this);
> mLayout = new QGridLayout(this);
> mLayout->addWidget(mButton, 0, 0, 1, 1);
> }
> 
> *and I have another class which subclass the class MyDialog*
> 
> class TestDialog : public MyDiaolog
> {
> Q_OBJECT
> 
> public:
> TestDialog(QWidget *parent = NULL);
> ~TestDialog ();
> 
> private:
> QPushButton * mButton1;
> QGridLayout * mRightLayou;
> QHBoxLayout * mHLayout;
> };
> 
> *int the constructor*
> 
> Dialog::Dialog(QWidget *parent)
> : MyDiaolog(parent)
> {
> mButton1 = new QPushButton("right", this);
> mRightLayou = new QGridLayout(this);
> mRightLayou->addWidget(mButton1, 0, 0, 1, 1);
> 
> mHLayout = new QHBoxLayout(this);
> mHLayout->addLayout(mLayout);
> mHLayout->addLayout(mRightLayou);
> 
> setLayout(mHLayout);
> }
> 
> I expect that the buttons layout side by side from left to right,
> but in fact the TestDialog's layout() return the mLayout;
> 
> How can I set the TestDialog's layout as mHlayout?

>From the setLayout() documentation:

If there already is a layout manager installed on this widget, QWidget
won't let you install another. You must first delete the existing layout
manager.

Bo.

-- 

Bo Thorsen, Fionia Software
Expert Qt and C++ developer for hire
Mail me if you need a hand with your Qt code