如何切换不透明到透明背景的子窗口

#include "trasparentwin.h" 
#include <QHBoxLayout> 
#include <QWidget> 
#include <QLabel> 
#include <QMoveEvent> 
#include <QPushButton> 
#include <QColor> 

TrasparentWin::TrasparentWin(QWidget *parent) 
:QWidget(parent) 
,second_wnd_(nullptr) 
,switch_(false) 
{ 
    setFixedSize(400, 400); 
    setObjectName("main_window"); 
    CreateSecondWidget(); 
    auto switch_button = new QPushButton(this); 
    switch_button->move(200, 200); 
    switch_button->setText("switch button"); 
    connect(switch_button, SIGNAL(clicked(bool)), this, SLOT(OnSwitch(bool))); 
    setStyleSheet("QWidget#main_window{background-color:gray;}"); 
} 

TrasparentWin::~TrasparentWin() 
{ 

} 

void TrasparentWin::CreateSecondWidget() 
{ 
    second_wnd_ = new QWidget(this); 
    second_wnd_->setObjectName("second_wnd"); 
    //second_wnd_->setStyleSheet("QWidget#second_wnd{background-color:gray;}"); 
    second_wnd_->setWindowFlags(second_wnd_->windowFlags() | Qt::Window | Qt::FramelessWindowHint); 
    second_wnd_->setAttribute(Qt::WA_DontCreateNativeAncestors); 
    second_wnd_->setAttribute(Qt::WA_NativeWindow); 
    second_wnd_->setFixedSize(100, 100); 
    auto second_layout = new QHBoxLayout(); 
    auto text_label = new QLabel(); 
    text_label->setText("Second Window"); 
    text_label->setFixedSize(50, 20); 
    second_layout->addWidget(text_label, 0, Qt::AlignVCenter); 
    second_wnd_->setLayout(second_layout); 
    second_wnd_->setVisible(true); 
    second_wnd_->setAutoFillBackground(true); 
} 

void TrasparentWin::moveEvent(QMoveEvent *e) 
{ 
    if (second_wnd_) 
    { 
     second_wnd_->move(e->pos()); 
    } 
} 

void TrasparentWin::OnSwitch(bool checked) 
{ 
    switch_ = !switch_; 
    if (switch_) 
    { 
     QPalette bgpal = second_wnd_->palette(); 
     bgpal.setColor (QPalette::Background, QColor (255, 255 , 0, 255)); 
     second_wnd_->setPalette(bgpal); 
    } 
    else 
    { 
     QPalette bgpal = second_wnd_->palette(); 
     bgpal.setColor (QPalette::Background, Qt::transparent); 
     second_wnd_->setPalette(bgpal); 
    } 
}

我首先单击switch_button是second_wnd背景颜色为黄色，然后我点击其次是swith_button背景second_wnd颜色深，然而，这不是我的本意。因为其次点击应该执行以下代码：如何切换不透明到透明背景的子窗口

QPalette bgpal = second_wnd_->palette(); 
bgpal.setColor (QPalette::Background, Qt::transparent); 
second_wnd_->setPalette(bgpal);

为什么second_wnd背景不透明？我怎么能做到这一点的是重复的透明度切换到非透明

来源

2015-08-26 xyCoder

您应该启用手动插件透明度：

second_wnd_->setAttribute(Qt::WA_TranslucentBackground, true);

来源

2015-08-26 04:12:55 RazrFalcon

@PazrFalcon我tryied，但我首先单击switch_button，second_wnd无法改变的背景。 – xyCoder

我不明白你的问题。为什么WA_TranslucentBackground不起作用？ – RazrFalcon

在我的情况下，我经常使用WA_TranslucentBackground true或false，没有工作 – xyCoder

如何切换不透明到透明背景的子窗口

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