Qt 模仿企业微信图标实现按钮图片文字上下结构

 简述

实现类似企业微信左侧导航栏的上下结构的按钮

效果图

可以用2种方案实现，2种最终效果图如下：

方案1 QToolButton 实现

	ui.toolButton->setFixedSize(50, 50);ui.toolButton->setCheckable(true);ui.toolButton->setAutoExclusive(true);ui.toolButton->setToolButtonStyle(Qt::ToolButtonTextUnderIcon);ui.toolButton_2->setFixedSize(50, 50);ui.toolButton_2->setCheckable(true);ui.toolButton_2->setAutoExclusive(true);ui.toolButton_2->setToolButtonStyle(Qt::ToolButtonTextUnderIcon);connect(ui.toolButton, &QToolButton::toggled, this, [=]() {ui.toolButton->setIcon(ui.toolButton->isChecked() ? QIcon(":/pafeyDemo/Resources/bar/nav_app_select.png") : QIcon(":/pafeyDemo/Resources/bar/nav_app_normal.png"));});connect(ui.toolButton_2, &QToolButton::toggled, this, [=]() {ui.toolButton_2->setIcon(ui.toolButton_2->isChecked() ? QIcon(":/pafeyDemo/Resources/bar/nav_app_select.png") : QIcon(":/pafeyDemo/Resources/bar/nav_app_normal.png"));});

qss

QToolButton
{border:none;background-color: rgba(255,255,255,0);color: #CADFFF;
}
QToolButton:hover
{border-radius:5px;background-color: rgba(255,255,255,15);color: #CADFFF;
}
QToolButton:checked
{border-radius:5px;background-color: rgba(255,255,255,20);color: #FFFFFF;
}
QToolButton:checked:hover
{ background-color: rgba(255,255,255,30);color: #FFFFFF; 
}

用 QToolButton 实现有个按下效果，按下之后图标会往右偏一点点。

UI像素眼表示不服，重做！

方案2 继承 QPushButton 重写 paintEvent 实现

新建一个继承自QPushButton的子类 QUpdownButton

QUpdownButton.h 

#pragma once#include <QPushButton>
#include "ui_QUpdownButton.h"class QUpdownButton : public QPushButton
{Q_OBJECT
public:QUpdownButton(const QString &text, QString iconNormal, QString iconSelect, QWidget *parent = Q_NULLPTR);~QUpdownButton();void paintEvent(QPaintEvent *event);private:Ui::QUpdownButton ui;QString m_text;QString m_iconNormal;QString m_iconSelect;
};

QUpdownButton.cpp

#include "QUpdownButton.h"
#include <QPainter>  
#include <QPixmap>  QUpdownButton::QUpdownButton(const QString &text, QString iconNormal, QString iconSelect, QWidget *parent): QPushButton(parent),m_text(text), m_iconNormal(iconNormal), m_iconSelect(iconSelect)
{ui.setupUi(this);setFixedSize(50, 50);setText(text);setStyleSheet(QString::fromLocal8Bit("\
QPushButton{ border-radius:6px; background-color: rgba(255,255,255,0); color: #CADFFF; font: 9pt \"微软雅黑\"; text-align: bottom; padding-bottom: 6px; }\
QPushButton:hover{ background-color: rgba(255,255,255,15); color: #CADFFF; }\
QPushButton:pressed{ background-color: rgba(255,255,255,20); color: #CADFFF; }\
QPushButton:checked{ background-color: rgba(255,255,255,20); color: #FFFFFF; }\
QPushButton:checked:hover{ background-color: rgba(255,255,255,30); color: #FFFFFF; }\"));
}QUpdownButton::~QUpdownButton()
{
}void QUpdownButton::paintEvent(QPaintEvent *event)
{QPushButton::paintEvent(event); // 调用基类的 paintEvent  QPainter painter(this);QRect buttonRect = this->rect();// 加载图片  QString btIcon = this->isChecked() ? m_iconSelect : m_iconNormal;QPixmap pixmap(btIcon);// 图标区域高度占按钮高度的2/3，文字占1/3  int iconAreaHeight = buttonRect.height() - (buttonRect.height() / 3); // 按钮图标尺寸20*20 int newWidth = 20;int newHeight = 20;// 计算图标位置  int x = (buttonRect.width() - newWidth) / 2;int y = (iconAreaHeight - newHeight) / 2;// 绘制缩放后的图片  QPixmap scaledPixmap = pixmap.scaled(newWidth, newHeight, Qt::KeepAspectRatio, Qt::SmoothTransformation);painter.drawPixmap(x, y, scaledPixmap);// 绘制文字  //QString text = this->text();//QRect textRect = QRect(0, scaledHeight-RATIO_X(6), buttonRect.width(), buttonRect.height() - scaledHeight);//painter.drawText(textRect, Qt::AlignCenter, m_text);
}

使用：

	ui.toolButton->setFixedSize(50, 50);ui.toolButton->setCheckable(true);ui.toolButton->setAutoExclusive(true);ui.toolButton->setToolButtonStyle(Qt::ToolButtonTextUnderIcon);ui.toolButton_2->setFixedSize(50, 50);ui.toolButton_2->setCheckable(true);ui.toolButton_2->setAutoExclusive(true);ui.toolButton_2->setToolButtonStyle(Qt::ToolButtonTextUnderIcon);connect(ui.toolButton, &QToolButton::toggled, this, [=]() {ui.toolButton->setIcon(ui.toolButton->isChecked() ? QIcon(":/pafeyDemo/Resources/bar/nav_app_select.png") : QIcon(":/pafeyDemo/Resources/bar/nav_app_normal.png"));});connect(ui.toolButton_2, &QToolButton::toggled, this, [=]() {ui.toolButton_2->setIcon(ui.toolButton_2->isChecked() ? QIcon(":/pafeyDemo/Resources/bar/nav_app_select.png") : QIcon(":/pafeyDemo/Resources/bar/nav_app_normal.png"));});m_updownButton = new QUpdownButton(QString::fromLocal8Bit("应用"), QString(":/pafeyDemo/Resources/bar/nav_app_normal.png"), QString(":/pafeyDemo/Resources/bar/nav_app_select.png"));m_updownButton2 = new QUpdownButton(QString::fromLocal8Bit("应用2"), QString(":/pafeyDemo/Resources/bar/nav_app_normal.png"), QString(":/pafeyDemo/Resources/bar/nav_app_select.png"));ui.verticalLayout_2->insertWidget(2, m_updownButton);ui.verticalLayout_2->insertWidget(3, m_updownButton2);m_updownButton->setCheckable(true);m_updownButton->setAutoExclusive(true);m_updownButton2->setCheckable(true);m_updownButton2->setAutoExclusive(true);

最终效果如下： 

第1,2图标是QToolButton，第3,4图标是重写 paintEvent 的 QPushButton 子类

第2种方案实现效果，图标的位置不会动了。

完工。