QT笔记——临时的悬浮窗口

需求：当我们的鼠标进入到一个按钮上时，我们需要出现一个临时的窗口，并且可以操控临时窗口

一开始我们的解决思路是： 我们写下 进入鼠标的事件，然后再写离开的事件
就可以很轻松的完成，但是在实际操作过程中发现了一些问题，它并不能操作到临时窗口

解决方案：在离开的时候 我们使用定时器TimerEvent事件 ，然后通过鼠标在 我们需要显示的区域的时候显示，离开我们需要的区域的时候 我们进行隐藏，并且杀死定时器

CustomItemWidget.h

#pragma once

#include <QWidget>
#include "ui_CustomItemWidget.h"
#include "CustomItemSubWidget.h"
#include <QMessageBox>
#include <QDebug>
#include <QTimerEvent>
#include <QEvent>
#include <QRect>
#include <QTimer>
#include <QPoint>

class CustomItemWidget : public QWidget
{
	Q_OBJECT

public:
	CustomItemWidget(QWidget* parent = Q_NULLPTR);
	~CustomItemWidget();

private:
	void InitItemWidget();
protected:
	virtual void timerEvent(QTimerEvent* event) Q_DECL_OVERRIDE;
	virtual bool eventFilter(QObject* watched, QEvent* event)Q_DECL_OVERRIDE;
private:
	Ui::CustomItemWidget ui;

	int	m_timerID;
	CustomItemSubWidget *m_customItemSubWidget;		//显示子界面
};

CustomItemWidget.cpp

#include "CustomItemWidget.h"

CustomItemWidget::CustomItemWidget(QWidget* parent)
	: QWidget(parent)
{
	ui.setupUi(this);

	InitItemWidget();

}

CustomItemWidget::~CustomItemWidget()
{

}

void CustomItemWidget::InitItemWidget()
{
	ui.pushButton_add->installEventFilter(this);
	m_customItemSubWidget = new CustomItemSubWidget();
}

bool CustomItemWidget::eventFilter(QObject* watched, QEvent* event)
{
	if (watched == ui.pushButton_add)
	{
		if (event->type() == QEvent::Enter)
		{
			m_customItemSubWidget->show();
			QPoint  btnPos(this->mapToGlobal(QPoint(ui.pushButton_add->x(), ui.pushButton_add->y() + ui.pushButton_add->height() / 2)));
			m_customItemSubWidget->move(btnPos - QPoint(m_customItemSubWidget->width(), m_customItemSubWidget->height() / 2));

			m_timerID = this->startTimer(1000);
			return true;
		}

	}
	return QWidget::eventFilter(watched, event);
}

void CustomItemWidget::timerEvent(QTimerEvent* event)
{
	int tmp = event->timerId();
	if (tmp == m_timerID)
	{
		if ((m_customItemSubWidget != nullptr) && (m_customItemSubWidget->isVisible()))
		{
			QPoint mousePoint = QCursor::pos();
			QPoint btnPos(this->mapToGlobal(QPoint(ui.pushButton_add->x(), ui.pushButton_add->y() + ui.pushButton_add->height() / 2)));

			QPoint rectWidgetTopLeft(btnPos - QPoint(m_customItemSubWidget->width(), m_customItemSubWidget->height() / 2));
			QPoint rectWidgetBottomRight(btnPos + QPoint(0, m_customItemSubWidget->height() / 2));
			QRect rectWidget(rectWidgetTopLeft, rectWidgetBottomRight);

			QPoint rectPushButtonTopLeft(btnPos - QPoint(0, ui.pushButton_add->height() / 2));
			QPoint rectPushButtonBottomRight(btnPos + QPoint(ui.pushButton_add->width(), ui.pushButton_add->height() / 2));
			QRect rectPushButton(rectPushButtonTopLeft, rectPushButtonBottomRight);

			if (!rectWidget.contains(mousePoint) && !rectPushButton.contains(mousePoint))
			{
				m_customItemSubWidget->hide();
				killTimer(tmp);
			}

		}
		else
		{
			killTimer(tmp);
		}
	}
}

CustomItemSubWidget .h

#pragma once

#include <QWidget>
#include "ui_CustomItemSubWidget.h"
#include <QComboBox>

class CustomItemSubWidget : public QWidget
{
	Q_OBJECT

public:
	CustomItemSubWidget(QWidget* parent = Q_NULLPTR);
	~CustomItemSubWidget();

private:
	void InitComboBoxData();

private:
	Ui::CustomItemSubWidget ui;

};

CustomItemSubWidget .cpp

#include "CustomItemSubWidget.h"

CustomItemSubWidget::CustomItemSubWidget(QWidget* parent)
	: QWidget(parent)
{
	ui.setupUi(this);
	InitComboBoxData();

	this->setWindowFlags(windowFlags() | Qt::FramelessWindowHint | Qt::Tool);
}

CustomItemSubWidget::~CustomItemSubWidget()
{
}

void CustomItemSubWidget::InitComboBoxData()
{
	ui.comboBox_Color->addItem("1");
	ui.comboBox_Combination->addItem("1");
	ui.comboBox_ManufactureCombination->addItem("1");
	ui.comboBox_Manufacturer->addItem("1");
	ui.comboBox_MaterialScience->addItem("1");
	ui.comboBox_Type->addItem("1");
}

成功效果图：

参考博客：
QT悬浮窗口相关