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POHow to auto-resize qt widget?
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  1. POHow to auto-resize qt widget?
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    copied!<p>QT Version: 4.5.2 OS: ubuntu 8.04</p> <p>I have a trouble with auto-resizing widget, here is an example:</p> <p><a href="http://img15.imageshack.us/img15/3479/autoresize.png" rel="nofollow noreferrer">alt text http://img15.imageshack.us/img15/3479/autoresize.png</a></p> <p>As the figure shows, here are two widgets, one is a "StrWidget"(the upper widget in the figure 1) which has 5 QLabels for showing strings, the other is a "CtrlWidget" which tells StrWidget what string to show.</p> <p>When I click "send CCC", the StrWidget becomes the widget shown in figure 2</p> <p>But when I click "send A" again, the StrWidget becomes the widget shown in figure 3</p> <p>There is a member function StrWidget::changeString which is a slot of StrWidget and receive the string for showing.</p> <pre><code>void StrWidget::changeString(QString inputStr) { for(int i=0;i&lt;5;i++){ strEntries[i]-&gt;setText(inputStr); } } </code></pre> <p>the StrWidget cannot auto-resize itself when changeString is called. I try the following two methods:</p> <p>(1) Insert "adjustSize()" in StrWidget::changeString, it works but I need to click a button twice to make it resized. I don't know why it happens.</p> <p>(2) Insert "hide();show();" in StrWidget::changeString, it works but the StrWidget would flush when I click buttons.</p> <p>Dose anyone have an idea about it? Thanks~</p> <hr> <p>The following is the source code of the example</p> <p>main:</p> <pre><code>#include "StrWidget.h" #include "CtrlWidget.h" #include &lt;QApplication&gt; int main(int argc,char *argv[]) { QApplication app(argc,argv); StrWidget *strWidget=new StrWidget(0); CtrlWidget *ctrlWidget=new CtrlWidget(0); strWidget-&gt;show(); ctrlWidget-&gt;show(); QObject::connect(ctrlWidget,SIGNAL(sendString(QString)),strWidget,SLOT(changeString(QString))); int ref=app.exec(); strWidget-&gt;deleteLater(); ctrlWidget-&gt;deleteLater(); return ref; } </code></pre> <p>StrWidget.h</p> <pre><code>#include &lt;QWidget&gt; #include &lt;QString&gt; #include &lt;QLabel&gt; #ifndef _StrWidget_H_ #define _StrWidget_H_ class StrWidget:public QWidget { Q_OBJECT public: StrWidget(QWidget *parent=0); private: QLabel *strEntries[5]; public slots: void changeString(QString inputStr); void clearString(); }; #endif </code></pre> <p>StrWidget.cpp</p> <pre><code>#include "StrWidget.h" #include &lt;QPushButton&gt; #include &lt;QHBoxLayout&gt; StrWidget::StrWidget(QWidget *parent):QWidget(parent) { //main layout QHBoxLayout *mainLayout=new QHBoxLayout(this); setLayout(mainLayout); //info label setup for(int i=0;i&lt;5;i++){ strEntries[i]=new QLabel(this); strEntries[i]-&gt;setText("A"); strEntries[i]-&gt;setFrameShape(QFrame::StyledPanel); mainLayout-&gt;addWidget(strEntries[i]); } //clearBtn setup QPushButton *clearBtn=new QPushButton(tr("Clear Str"),this); connect(clearBtn,SIGNAL(clicked()),this,SLOT(clearString())); mainLayout-&gt;addWidget(clearBtn); } void StrWidget::changeString(QString inputStr) { for(int i=0;i&lt;5;i++){ strEntries[i]-&gt;setText(inputStr); } } void StrWidget::clearString() { changeString(""); } </code></pre> <p>CtrlWidget.h</p> <pre><code>#include &lt;QWidget&gt; #include &lt;QString&gt; #ifndef _CtrlWidget_H_ #define _CtrlWidget_H_ class CtrlWidget:public QWidget { Q_OBJECT public: CtrlWidget(QWidget *parent=0); signals: void sendString(QString sentStr); }; </code></pre> <p>CtrlWidget.cpp</p> <pre><code>#include "CtrlWidget.h" #include &lt;QHBoxLayout&gt; #include &lt;QPushButton&gt; #include &lt;QSignalMapper&gt; CtrlWidget::CtrlWidget(QWidget *parent):QWidget(parent) { //main layout QHBoxLayout *mainLayout=new QHBoxLayout(this); setLayout(mainLayout); //control btns setup QPushButton *sendABtn=new QPushButton("send A",this); QPushButton *sendBBBtn=new QPushButton("send BB",this); QPushButton *sendCCCBtn=new QPushButton("send CCC",this); mainLayout-&gt;addWidget(sendABtn); mainLayout-&gt;addWidget(sendBBBtn); mainLayout-&gt;addWidget(sendCCCBtn); //map setup QSignalMapper *btnMapper=new QSignalMapper(this); btnMapper-&gt;setMapping(sendABtn,"A"); btnMapper-&gt;setMapping(sendBBBtn,"BB"); btnMapper-&gt;setMapping(sendCCCBtn,"CCC"); connect(btnMapper,SIGNAL(mapped(QString)),this,SIGNAL(sendString(QString))); //connection setup connect(sendABtn,SIGNAL(clicked()),btnMapper,SLOT(map())); connect(sendBBBtn,SIGNAL(clicked()),btnMapper,SLOT(map())); connect(sendCCCBtn,SIGNAL(clicked()),btnMapper,SLOT(map())); } </code></pre>
 

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