QToolButton

main.cpp

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
#include <QApplication>
#include <QWidget>
#include <QToolButton>
#include <QVBoxLayout>
#include <QHBoxLayout>
#include <QMenu>
#include <QStyle>
#include <QDebug>

void setupToolButtonDemo(QWidget *parent) {
    QVBoxLayout *mainLayout = new QVBoxLayout(parent);
    QHBoxLayout *rowLayout = new QHBoxLayout();

    // --- 1. 基础图标按钮 ---
    QToolButton *homeBtn = new QToolButton(parent);
    // 使用系统自带的标准图标（Home 图标）
    homeBtn->setIcon(parent->style()->standardIcon(QStyle::SP_DirHomeIcon));
    homeBtn->setToolTip("返回主页"); // 悬停提示

    // --- 2. 带文字和图标的按钮 ---
    QToolButton *editBtn = new QToolButton(parent);
    editBtn->setText("编辑文档");
    editBtn->setIcon(parent->style()->standardIcon(QStyle::SP_FileDialogContentsView));
    // 设置显示模式：图标在文字上方
    editBtn->setToolButtonStyle(Qt::ToolButtonTextUnderIcon);

    // --- 3. 弹出菜单模式 (MenuButtonPopup) ---
    QToolButton *menuBtn = new QToolButton(parent);
    menuBtn->setText("新建项目");
    menuBtn->setIcon(parent->style()->standardIcon(QStyle::SP_FileIcon));
    menuBtn->setToolButtonStyle(Qt::ToolButtonTextBesideIcon);

    // 创建菜单
    QMenu *newMenu = new QMenu(menuBtn);
    newMenu->addAction("C++ 项目");
    newMenu->addAction("Python 项目");
    newMenu->addAction("Qt 项目");

    menuBtn->setMenu(newMenu);
    // 设置弹出模式：点击小箭头弹出菜单
    menuBtn->setPopupMode(QToolButton::MenuButtonPopup);

    // --- 4. 信号处理 ---
    QObject::connect(homeBtn, &QToolButton::clicked, []() {
        qDebug() << "主页按钮被点击了";
    });

    QObject::connect(newMenu, &QMenu::triggered, [](QAction *action) {
        qDebug() << "选择了新建：" << action->text();
    });

    rowLayout->addWidget(homeBtn);
    rowLayout->addWidget(editBtn);
    rowLayout->addWidget(menuBtn);
    mainLayout->addLayout(rowLayout);
    mainLayout->addStretch();
}

int main(int argc, char *argv[]) {
    QApplication a(argc, argv);
    QWidget w;
    w.setWindowTitle("QToolButton 工具按钮演示");
    w.resize(400, 200);
    setupToolButtonDemo(&w);
    w.show();
    return a.exec();
}