1f66098277
p03/ 生成产物与 docs/teaching/examples/ 手工示例里的 QTimer::singleShot 自动退出逻辑,从"始终 200ms 后退出"改为"仅当 QT_QPA_PLATFORM=offscreen 时才退出"。正常运行(有显示环境)窗口保持打开,需手动关闭;离屏自动化 验证(tools/run_qt.sh + QT_QPA_PLATFORM=offscreen)行为不变。 p03/ 改动来自重新生成 tools/gen_part3.py(AUTO_QUIT 常量加 qgetenv 判断), 未手改生成产物。QCoreApplication 控制台风格示例(qfile_basic 等)本就 执行完即退出,不受影响。
53 lines
2.0 KiB
C++
53 lines
2.0 KiB
C++
// ============================================================================
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// mouse_event — Qt 桌面示例
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// 来源:川大 C++/LinuxC wiki「02.Qt方向」
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// 原文片段:[58954546:0]
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// 说明:本文件由 gen_part3.py 从 wiki 片段生成(必要时补 main/QApplication
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// 外壳、include、修正笔误)。详见 docs/ERRATA.md。
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// 离屏验证:QT_QPA_PLATFORM=offscreen tools/run_qt.sh <target>(自动退出)
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// ============================================================================
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#include <QApplication>
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#include <QWidget>
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#include <QLabel>
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#include <QMouseEvent>
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#include <QString>
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#include <QTimer>
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// 自定义 QLabel:重写鼠标事件,显示坐标
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class EventLabel : public QLabel {
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Q_OBJECT
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public:
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explicit EventLabel(QWidget* p = nullptr) : QLabel(p) {
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setMouseTracking(true); // 启用鼠标移动追踪(默认只在按键时追踪)
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setText(QStringLiteral("移动鼠标到这里"));
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}
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protected:
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void mouseMoveEvent(QMouseEvent* event) override {
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setText(QString("<center><h1>Move: (%1, %2)</h1></center>")
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.arg(event->x()).arg(event->y()));
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}
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void mousePressEvent(QMouseEvent* event) override {
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setText(QString("<center><h1>Press: (%1, %2)</h1></center>")
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.arg(event->x()).arg(event->y()));
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}
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void mouseReleaseEvent(QMouseEvent* event) override {
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setText(QString("<center><h1>Release: (%1, %2)</h1></center>")
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.arg(event->x()).arg(event->y()));
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}
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};
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int main(int argc, char* argv[]) {
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QApplication app(argc, argv);
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EventLabel w;
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w.show();
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// 仅在离屏自动化验证时(QT_QPA_PLATFORM=offscreen)200ms 后自动退出;
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// 正常运行(有显示环境)窗口保持打开,不自动退出。
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if (qgetenv("QT_QPA_PLATFORM") == "offscreen") {
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QTimer::singleShot(200, &app, &QApplication::quit);
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}
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return app.exec();
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}
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#include "mouse_event.moc"
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