Qt QLabel 變顏色小例子

// 重載QLabel<br />// diamond.h</p><p>#pragma once</p><p>#include <QtGui></p><p>class diamond : QLabel<br />{<br />Q_OBJECT</p><p>public:<br />diamond();<br />~diamond();</p><p>private:<br />voidmousePressEvent ( QMouseEvent * event ); // 重載mousePressEvent函數</p><p>private:<br />voidchangeColor(bool b_c);<br />voidchangeState();</p><p>private:<br />boolb_mChecked;<br />}; 

// diamond.cpp</p><p>#include "diamond.h"</p><p>diamond::diamond()<br />:b_mChecked(false)<br />{<br />setStyleSheet("background-color:yellow");</p><p>setFixedSize(40,40);<br />}</p><p>diamond::~diamond()<br />{</p><p>}</p><p>void diamond::mousePressEvent( QMouseEvent * event )<br />{<br />// 改變選擇狀態<br />changeState();</p><p>// 改變表徵圖顏色<br />changeColor(b_mChecked);<br />}</p><p>void diamond::changeColor(bool b_c)<br />{<br />if(b_c)<br />setStyleSheet("background-color:red"); // 設定QLabel背景的顏色<br />else<br />setStyleSheet("background-color:yellow");<br />}</p><p>void diamond::changeState()<br />{<br />b_mChecked = !b_mChecked;<br />}<br />

 

// magic.h</p><p>#ifndef MAGIC_H<br />#define MAGIC_H</p><p>#include <QtGui></p><p>class diamond;</p><p>class magic : public QDialog<br />{<br />Q_OBJECT</p><p>public:<br />magic(QWidget *parent = 0, Qt::WFlags flags = 0);<br />~magic();</p><p>private:<br />voidinitDiamonds();<br />QLabel*createDiamond();</p><p>private:<br />QGridLayout*g_lay;<br />};</p><p>#endif // MAGIC_H<br />

// magic.cpp</p><p>#include "magic.h"<br />#include "diamond.h"</p><p>magic::magic(QWidget *parent, Qt::WFlags flags)<br />: QDialog(parent, flags)<br />{<br />g_lay = new QGridLayout;</p><p>setLayout(g_lay);</p><p>resize(400,400);</p><p>initDiamonds();<br />}</p><p>magic::~magic()<br />{</p><p>}</p><p>void magic::initDiamonds()<br />{<br />// 迴圈添加多個QLabel<br />for(int i = 0; i<10; i++)<br />{<br />for(int j=0; j<10; j++)<br />{<br />g_lay->addWidget(createDiamond(),i,j);<br />}<br />}<br />}</p><p>QLabel* magic::createDiamond()<br />{<br />diamond* d = new diamond;<br />return (QLabel*)(d);<br />}