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Qpalette learning notes

2022-07-29 08:20:00 【cloud_ yq】

QPalette Class is equivalent to the palette of dialog boxes or controls , It manages all the color information of the control or form , Each form or control contains a QPalette object , When displaying, follow its QPalette Object to describe the color of each part in each state .

QPalette Class has two basic data types ： One is ColorGroup, Used to distinguish the color information of space or form in different states ; The other is ColorRole, Color information used to distinguish different components of controls or forms . The specific explanation is as follows ：

ColorGroup：

QPalette::Disabled	Unavailable status
QPalette::Active	Active state （ Focus of attention ）
QPalette::Inactive	Inactive state （ No focus ）

ColorRole：

QPalette::Window	A regular background color
QPalette::Background	This value is obsolete , Use window Instead of
QPalette::WindowText	A general foreground color ( text color )
QPalette::Foreground	This value is obsolete , Use windowText Instead of .
QPalette::Base	Mainly use the composition input widget （QTextEdit、QListView etc. ） Background color , It can also be used for other , Such as combobox Drop down lists and toolbar.
QPalette::Text	And QPalette::Base Corresponding , Mainly use the composition input widget （QTextEdit、QListView etc. ） The color of the text
QPalette::AlternateBase	Used as the background color for alternating view lines （ When the view has the row background color alternation attribute set setAlternatingRowColors(true)）, And QPalette::Base Distinguish
QPalette::ToolTipBase	Used as a background color for QToolTip and QWhatsThis. Tool tip use QPalette Inactive color groups , Because the tool tip is not an active window .
QPalette::ToolTipText	Used as a foreground color for QToolTip and QWhatsThis. Tool tip use QPalette Inactive color groups , Because the tool tip is not an active window .
QPalette::Button	button The background color . This background color can be different from window As some styles , Require a different background color as button
QPalette::ButtonText	A foreground color is used as button Color .
QPalette::BrightText	One text The color is very different from windowText, Good contrast with dark. Typically used for text, Need to be painted , stay text perhaps windowText Will give a poor comparison , It's like pressing button. Be careful text Color can be used for things , Not just words ;text Color is usually used for text, But it is quite common to use text Color role is line , Icon , wait .

QPalette Mainly through the following four functions to achieve the color setting of controls or forms ：

void QPalette::setColor ( ColorRole role, const QColor & color );

void QPalette::setColor ( ColorGroup group, ColorRole role, const QColor & color );

void QPalette::setBrush ( ColorRole role, const QBrush & brush );

void QPalette::setBrush ( ColorGroup group, ColorRole role, const QBrush & brush );

among ,setBrush Can be set by QBrush To set the background image of the control or form . in addition , It should be noted that in setting dialog boxes and controls （QPushButton、QFrame etc. ） You need to use

void setAutoFillBackground ( bool enabled ); Set its background to fill .

Next, an example is given （Qt Create a QWidget project ）：

//Wdiget.h

#ifndef WIDGET_H
#define WIDGET_H

#include <QWidget>
#include <QComboBox>
#include <QFrame>

class Widget : public QWidget
{
    Q_OBJECT

public:
    Widget(QWidget *parent = nullptr);
    ~Widget();


private:
    // Member variables 
    QFrame *sFrame;
    QFrame *cFrame;
    QComboBox *cbWin;
    QComboBox *cbWinText;
    QComboBox *cbBtn;
    QComboBox *cbBtnText;
    QComboBox *cbBase;
    QComboBox *cbText;
    QComboBox *cbAlter;



    // Member functions 

    void seletFrame();
    void contentFrame();
    void fillComboBox(QComboBox *);


private slots:


    void cbWin_s();
    void cbWinText_s();
    void cbBtn_s();
    void cbBtnText_s();
    void cbBase_s();
    void cbText_s();
    void cbAlter_s();

};

#endif // WIDGET_H

//Widget.cpp


#include "widget.h"
#include <QHBoxLayout>
#include <QVBoxLayout>
#include <QPushButton>
#include <QTextEdit>
#include <QStringList>
#include <QListView>
#include <QStringListModel>
#include <QLabel>
#include <QGroupBox>
#include <QPixmap>
#include <QIcon>
#include <QSizePolicy>
#include <QDebug>
#include <QLineEdit>



Widget::Widget(QWidget *parent)
    : QWidget(parent)
{
    seletFrame();
    contentFrame();

    QHBoxLayout *gHblayout = new QHBoxLayout(this);
    gHblayout->addWidget(sFrame);
    gHblayout->addWidget(cFrame);
    gHblayout->setMargin(10);
    gHblayout->setSpacing(5);
    gHblayout->setSizeConstraint(QLayout::SetFixedSize);



}

Widget::~Widget()
{
}

void Widget::seletFrame()
{
    sFrame = new QFrame;

    QLabel *label1 = new QLabel("Qt::Window");
    cbWin = new QComboBox;
    fillComboBox(cbWin);
    connect(cbWin,SIGNAL(activated(int)),this,SLOT(cbWin_s()));


    QLabel *label2 = new QLabel("Qt::WindowText");
    cbWinText = new QComboBox;
    fillComboBox(cbWinText);
    connect(cbWinText,SIGNAL(activated(int)),this,SLOT(cbWinText_s()));
    //connect(cbWinText,&QComboBox::activated,this,&Widget::cbWinText_s());


    QGridLayout *s1Layout = new QGridLayout;
    s1Layout->addWidget(label1,0,0);
    s1Layout->addWidget(cbWin,0,1);
    s1Layout->addWidget(label2,1,0);
    s1Layout->addWidget(cbWinText,1,1);
    s1Layout->setSizeConstraint(QLayout::SetFixedSize);

    QGroupBox *s1GroupBox = new QGroupBox("Window corlor");
    s1GroupBox->setLayout(s1Layout);


    QLabel *label3 = new QLabel("Qt::Button");
    cbBtn = new QComboBox;
    fillComboBox(cbBtn);
    connect(cbBtn,SIGNAL(activated(int)),this,SLOT(cbBtn_s()));

    QLabel *label4 = new QLabel("Qt::ButtonText");
    cbBtnText = new QComboBox;
    fillComboBox(cbBtnText);
    connect(cbBtnText,SIGNAL(activated(int)),this,SLOT(cbBtnText_s()));

    QLabel *label5 = new QLabel("Qt::Base");
    cbBase = new QComboBox;
    fillComboBox(cbBase);
    connect(cbBase,SIGNAL(activated(int)),this,SLOT(cbBase_s()));

    QLabel *label6 = new QLabel("Qt::Text");
    cbText = new QComboBox;
    fillComboBox(cbText);
    connect(cbText,SIGNAL(activated(int)),this,SLOT(cbText_s()));

    QLabel *label7 = new QLabel("Qt::AlternateBase");
    cbAlter = new QComboBox;
    fillComboBox(cbAlter);
    connect(cbAlter,SIGNAL(activated(int)),this,SLOT(cbAlter_s()));

    QGridLayout *sgLayout =new QGridLayout(sFrame);
    sgLayout->addWidget(s1GroupBox,0,0,1,2);   // merge cell , from （0,0） Greg started , occupy 1 That's ok 2 Column 
    sgLayout->addWidget(label3,1,0);
    sgLayout->addWidget(cbBtn,1,1);
    sgLayout->addWidget(label4,2,0);
    sgLayout->addWidget(cbBtnText,2,1);
    sgLayout->addWidget(label5,3,0);
    sgLayout->addWidget(cbBase,3,1);
    sgLayout->addWidget(label6,4,0);
    sgLayout->addWidget(cbText,4,1);
    sgLayout->addWidget(label7,5,0);
    sgLayout->addWidget(cbAlter,5,1);
    sgLayout->setMargin(5);

}

void Widget::contentFrame()
{
    cFrame = new QFrame();
    cFrame->setLineWidth(2);
    cFrame->setFrameStyle(QFrame::Box|QFrame::Raised);

    QLabel *labString = new QLabel("please input a string");
    QLineEdit *edtString = new QLineEdit;
    QHBoxLayout *stringWidget = new QHBoxLayout;
    stringWidget->addWidget(labString);
    stringWidget->addWidget(edtString);
    stringWidget->setSpacing(5);

    QListView *cListV = new QListView;
    QStringList cstrL;
    cstrL << " The man is determined to leave the countryside "<<" Learn not to be famous, swear not to return "<<" Castle Peak is full of bones "<<" Why do you need to return the clothes ";
    QStringListModel *cListM = new QStringListModel(cstrL);
    cListV->setModel(cListM);
    cListV->setAlternatingRowColors(true);

    QTextEdit *cTextE = new QTextEdit(" wine is glowing in the luminous jade cups ");
    cTextE->append(" If you want to drink pipa, hurry up immediately ");
    cTextE->append(" Don't laugh when you are drunk on the battlefield ");
    cTextE->append(" In ancient times, several people fought back ");


    QPushButton *okBtn = new QPushButton(" confirm ");
    QPushButton *cancalBtn = new QPushButton(" Cancel ");
    QHBoxLayout *cHLayout = new QHBoxLayout;
    cHLayout->addStretch(1);
    cHLayout->addWidget(okBtn);
    cHLayout->addWidget(cancalBtn);

    QVBoxLayout *cVLayout = new QVBoxLayout(cFrame);
    cVLayout->addLayout(stringWidget);
    cVLayout->addWidget(cListV);
    cVLayout->addWidget(cTextE);
    cVLayout->addLayout(cHLayout);
    cVLayout->setMargin(15);
    cVLayout->setSpacing(5);

    okBtn->setAutoFillBackground(true);
    cancalBtn->setAutoFillBackground(true);
    cFrame->setAutoFillBackground(true);
}


void Widget::fillComboBox(QComboBox *c)
{
    QStringList colorList = QColor::colorNames();
    QString colorName;

    foreach(colorName,colorList)
    {
        QPixmap s_color = QPixmap(70,20);
        s_color.fill(QColor(colorName));

        //QIcon s_color  = QIcon(colorName);
        c->addItem(QIcon(s_color),NULL);
        c->setIconSize(QSize(70,20));
        c->setSizeAdjustPolicy(QComboBox::AdjustToContents);

    }

}

void Widget::cbWin_s()
{
    qDebug()<<" Get into cbWin_s() Slot function ";
     QStringList colors = QColor::colorNames();
     QPalette p = cFrame->palette();
     p.setColor(QPalette::Window,QColor(colors[cbWin->currentIndex()]));
     cFrame->setPalette(p);

}

void Widget::cbWinText_s()
{
    QStringList colors = QColor::colorNames();
    QPalette p = cFrame->palette();
    p.setColor(QPalette::WindowText,QColor(colors[cbWinText->currentIndex()]));
    cFrame->setPalette(p);

}

void Widget::cbBtn_s()
{
    QStringList colors = QColor::colorNames();
    QPalette p = cFrame->palette();
    p.setColor(QPalette::Button,QColor(colors[cbBtn->currentIndex()]));
    cFrame->setPalette(p);
}

void Widget::cbBtnText_s()
{
    QStringList colors = QColor::colorNames();
    QPalette p = cFrame->palette();
    p.setColor(QPalette::ButtonText,QColor(colors[cbBtnText->currentIndex()]));
    cFrame->setPalette(p);
}

void Widget::cbBase_s()
{
    QStringList colors = QColor::colorNames();
    QPalette p = cFrame->palette();
    p.setColor(QPalette::Base,QColor(colors[cbBase->currentIndex()]));
    cFrame->setPalette(p);
}

void Widget::cbText_s()
{
    QStringList colors = QColor::colorNames();
    QPalette p = cFrame->palette();
    p.setColor(QPalette::Text,QColor(colors[cbText->currentIndex()]));
    cFrame->setPalette(p);
}

void Widget::cbAlter_s()
{
    QStringList colors = QColor::colorNames();
    QPalette p = cFrame->palette();
    p.setColor(QPalette::AlternateBase,QColor(colors[cbAlter->currentIndex()]));
    cFrame->setPalette(p);
}

Result chart ：