http://blog.csdn.net/zddblog/article/details/11116191
功能:鼠标弹起并在按键区域内时,按键响应。并实现normal、hover、pressed效果,PushButton大小默认为传入图片大小。
PushButton的normal、hover、pressed效果没有使用QSS实现,因为重写mouseReleaseEvent后,qss的hover效果混乱。
用法:
- loginButton = new PushButton(":/button/login_button_normal",
- ":/button/login_button_hover",
- ":/button/login_button_pressed");
loginButton = new PushButton(":/button/login_button_normal",
":/button/login_button_hover",
":/button/login_button_pressed");
或者:
- loginButton = new PushButton(":/button/login_button");
loginButton = new PushButton(":/button/login_button");
效果:
具体实现:
- #include "pushbutton.h"
- #include <QPainter>
- #include <QMouseEvent>
- #include <QFontMetrics>
- #include <QLabel>
- PushButton::PushButton(QString normal, QString hover, QString pressed, QWidget *parent) :
- QPushButton(parent)
- {
- buttonState = Normal;
- normalPixmap.load(normal);
- hoverPixmap.load(hover);
- pressPixmap.load(pressed);
- this->setFixedSize(normalPixmap.size());
- this->setContentsMargins(0, 0, 0, 0);
- }
- PushButton::PushButton(QString background, QWidget *parent) :
- QPushButton(parent)
- {
- buttonState = Normal;
- normalPixmap.load(background);
- hoverPixmap.load(background);
- pressPixmap.load(background);
- this->setFixedSize(normalPixmap.size());
- this->setContentsMargins(0, 0, 0, 0);
- }
- void PushButton::paintEvent(QPaintEvent *)
- {
- QPainter painter(this);
- switch(buttonState)
- {
- case Normal:
- painter.drawPixmap(this->rect(), normalPixmap);
- break;
- case Hover:
- painter.drawPixmap(this->rect(), hoverPixmap);
- break;
- case Pressed:
- painter.drawPixmap(this->rect(), pressPixmap);
- }
- painter.drawText(this->rect(), Qt::AlignCenter, this->text());
- }
- void PushButton::enterEvent(QEvent *)
- {
- buttonState = Hover;
- update();
- }
- void PushButton::leaveEvent(QEvent *)
- {
- buttonState = Normal;
- update();
- }
- void PushButton::mousePressEvent(QMouseEvent *e)
- {
- if(e->button() == Qt::LeftButton)
- {
- buttonState = Pressed;
- update();
- }
- }
- bool isOnPushButton(const QPoint &point, const PushButton *pushButton)
- {
- if(point.x() < 0 || point.x() > pushButton->width() ||
- point.y() < 0 || point.y() > pushButton->height())
- {
- return false;
- }
- return true;
- }
- void PushButton::mouseReleaseEvent(QMouseEvent *e)
- {
- if(e->button() == Qt::LeftButton)
- {
- //判断鼠标抬起时是否在PushButton之上
- if(isOnPushButton(e->pos(), this))
- {
- emit clicked();
- }
- buttonState = Hover;
- update();
- }
- }