跟随

image_show.cpp

@@ -0,0 +1,48 @@
+#include "image_show.h"
+#include <QHBoxLayout>
+#include <QDebug>
+#include <QPainter>
+#include <DDialog>
+DWIDGET_USE_NAMESPACE
+image_show::image_show(QWidget *parent) : QWidget(parent)
+{
+    QHBoxLayout *layout=new QHBoxLayout;
+    layout->addWidget(m_label);
+    setLayout(layout);
+    m_label->setText("layout");
+
+}
+
+void image_show::setImage(QPixmap image)
+{
+
+    QImage screen0;
+    screen0=image.toImage();
+    QPainter painter(&screen0);
+    QImage re_screen1;
+    QImage re_screen0=screen0.scaled(QSize(400,300),Qt::KeepAspectRatio,Qt::SmoothTransformation);
+    //防止图片尺寸过大导致窗口覆盖整个屏幕
+    if(screen0.width()>1024 || screen0.height()>768){
+        re_screen1=screen0.scaled(QSize(1024,768),Qt::KeepAspectRatio,Qt::SmoothTransformation);
+    }else {
+        re_screen1=screen0;
+
+    }
+
+    m_image=QPixmap::fromImage(re_screen1);
+    m_label->setPixmap(QPixmap::fromImage(re_screen0));
+}
+
+void image_show::mousePressEvent(QMouseEvent *)
+{
+    image.setPixmap(m_image);
+    m_dialog->setTitle("截图预览");
+    image.setAlignment(Qt::AlignCenter);
+    m_dialog->layout()->addWidget(&image);
+    m_dialog->layout()->setMargin(10);
+    image.setMaximumSize(1024,768);
+    m_dialog->setWindowFlags(m_dialog->windowFlags() | Qt::WindowStaysOnTopHint);//设置图片对话框总在最前
+    image.show();
+    m_dialog->hide();
+    m_dialog->exec();
+}