第47课 Qt中的调色板
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1. QPalette类
(1)QPalette类提供了绘制QWidget组件的不同状态所使用的颜色。
(2)QPalette对象包含了3个状态的颜色描述
①激活颜色组(Active):组件获得焦点使用的颜色搭配方案
②非激活颜色组(Inactive):组件失去焦点使用的颜色方案
③失效颜色组(Disabled):组件处于不可用状态使用的颜色方案
2.QPalette类中颜色组用途
(1)QPalette类中的颜色组定义了组细节的颜色值
(2)QPalette::ColorRole中的常量值用于标识当前GUI界面中颜色的职责。如,QPalette::Window指窗口部件的背景色、QPalette::WindowText指前景色。QPalette指按钮的背景色、QPalette::ButtonText指按钮的前景色等。
3. 理解Qt中的调色板
(1)调色板是存储组件颜色信息的数据结构
|
WindowText |
Highlight |
…… |
ButtonText |
Active |
black |
blue |
…… |
black |
Inactive |
black |
Gray |
…… |
black |
Disabled |
gray |
Gray |
…… |
gray |
理解: |
1.调色板是存储组件颜色信息的数据结构 2.组件外观所使用的颜色都位于调色板中 |
(2)调色板的使用方式
QPalette p = widget.palette(); //获取组件的调色板 //改变widget前景色 p.setColor(QPalette::Active, QPalette::WindowText, Qt::blue); p.setColor(QPalette:Inactive, QPalette::WindowText, Qt::blue); widget.setPalette(p);//更新设置
【编程实验】Qt中调色板的使用
//main.cpp
#include "Widget.h" #include <QApplication> int main(int argc, char *argv[]) { QApplication a(argc, argv); Widget w; w.show(); return a.exec(); }
//Widget.h
#ifndef WIDGET_H #define WIDGET_H #include <QWidget> #include <QPushButton> #include <QLineEdit> #include <QLabel> class Widget : public QWidget { Q_OBJECT QPushButton m_button; QLineEdit m_edit; QLabel m_label; protected slots: void onButtonClicked(); public: Widget(QWidget *parent = 0); ~Widget(); }; #endif // WIDGET_H
//Widget.cpp
#include "Widget.h" Widget::Widget(QWidget *parent) : QWidget(parent),m_button(this),m_edit(this),m_label(this) { m_label.move(10, 10); m_label.resize(150,25); m_label.setText("Test"); m_edit.move(10, 45); m_edit.resize(150, 25); m_button.move(10, 80); m_button.resize(150, 25); m_button.setText("Test"); connect(&m_button, SIGNAL(clicked()), this, SLOT(onButtonClicked())); QPalette p = m_button.palette(); p.setColor(QPalette::Active, QPalette::ButtonText, Qt::red); p.setColor(QPalette::Inactive, QPalette::ButtonText, Qt::red); m_button.setPalette(p); p = m_edit.palette(); p.setColor(QPalette::Inactive, QPalette::Highlight, Qt::blue); p.setColor(QPalette::Inactive, QPalette::HighlightedText, Qt::white); m_edit.setPalette(p); } void Widget::onButtonClicked() { QPalette p = m_label.palette(); p.setColor(QPalette::Active, QPalette::WindowText, Qt::green); p.setColor(QPalette::Inactive, QPalette::WindowText, Qt::green); m_label.setPalette(p); } Widget::~Widget() { }
【编程实验】NotePad中查找功能的优化(失去焦点时仍高亮标识找到的文本)
//main.cpp //与上例相同
//FontDialog.h //与上例相同
//FontDialog.cpp //与上例相同
//MainWindow.h //与上例相同
//MainWindowUI.cpp
#include "MainWindow.h" #include <QMenu> #include <QToolBar> #include <QStatusBar> #include <QLabel> MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent),m_pFindDlg(new FindDialog(this,&mainEditor)) { setWindowTitle("NotePad - [ New ]"); mainEditor.setAcceptDrops(false);//默认下,QPlainTextEdit是接收拖放事件的 //其父对象会收不到“拖放”事件,这里设为false setAcceptDrops(true); //由MainWindow来接管拖放事件 m_filePath = ""; m_isTextChanged = false; } //二阶构造中的第2阶构造 bool MainWindow::construct() { bool ret = true; ret = ret && initMenuBar(); ret = ret && initToolBar(); ret = ret && initStatusBar(); ret = ret && initMainEditor(); return ret; } MainWindow* MainWindow::NewInstance() { MainWindow* ret = new MainWindow(); if((ret == NULL) || !ret->construct()) { delete ret; ret = NULL; } return ret; } //初始化菜单栏 bool MainWindow::initMenuBar() { bool ret = true; QMenuBar* mb = menuBar(); //menuBar为QMainWindow的成员变量 ret = ret && initFileMenu(mb); ret = ret && initEditMenu(mb); ret = ret && initFormatMenu(mb); ret = ret && initViewMenu(mb); ret = ret && initHelpMenu(mb); return ret; } //初始化工具栏 bool MainWindow::initToolBar() { bool ret = true; QToolBar* tb = addToolBar("Tool Bar"); tb->setIconSize(QSize(16, 16)); ret = ret && initFileToolItem(tb); tb->addSeparator(); ret = ret && initEditToolItem(tb); tb->addSeparator(); ret = ret && initFormatToolItem(tb); tb->addSeparator(); ret = ret && initViewToolItem(tb); return ret; } //初始化状态栏 bool MainWindow::initStatusBar() { bool ret = true; QStatusBar* sb = statusBar(); QLabel* label = new QLabel("D.T.Software"); if( label != NULL ) { statusLbl.setMinimumWidth(200); statusLbl.setAlignment(Qt::AlignCenter); statusLbl.setText("Ln: 1 Col: 1"); label->setMinimumWidth(200); label->setAlignment(Qt::AlignCenter); sb->addPermanentWidget(new QLabel()); //添加分隔线 sb->addPermanentWidget(&statusLbl); sb->addPermanentWidget(label); } else { ret = false; } return ret; } //初始化主文本编辑组件 bool MainWindow::initMainEditor() { bool ret = true; QPalette p = mainEditor.palette(); p.setColor(QPalette::Inactive, QPalette::Highlight, p.color(QPalette::Active, QPalette::Highlight)); p.setColor(QPalette::Inactive, QPalette::HighlightedText, p.color(QPalette::Active, QPalette::HighlightedText)); mainEditor.setPalette(p); mainEditor.setParent(this); connect(&mainEditor, SIGNAL(textChanged()), this, SLOT(onTextChanged())); connect(&mainEditor, SIGNAL(copyAvailable(bool)),this,SLOT(onCopyAvailable(bool))); connect(&mainEditor, SIGNAL(redoAvailable(bool)),this,SLOT(onRedoAvailable(bool))); connect(&mainEditor, SIGNAL(undoAvailable(bool)),this,SLOT(onUndoAvailable(bool))); connect(&mainEditor, SIGNAL(cursorPositionChanged()), this, SLOT(onCursorPositionChanged())); setCentralWidget(&mainEditor); return ret; } //文件(下拉)菜单 bool MainWindow::initFileMenu(QMenuBar* mb) { QMenu* menu = new QMenu("File(&F)", mb);//指定parent为mb bool ret = (menu != NULL); if ( ret ) { QAction* action = NULL; //"新建"菜单项 ret = ret && makeAction(action, mb, "New(&N)", Qt::CTRL + Qt::Key_N); if(ret) { connect(action, SIGNAL(triggered()), this, SLOT(onFileNew())); menu->addAction(action); //add Action to Menu Item } //"打开"菜单项 ret = ret && makeAction(action, mb, "Open(&O)...", Qt::CTRL + Qt::Key_O); if(ret) { connect(action, SIGNAL(triggered()), this, SLOT(onFileOpen())); menu->addAction(action); //add Action to Menu Item } //"保存"菜单项 ret = ret && makeAction(action, mb, "Save(&S)", Qt::CTRL + Qt::Key_S); if(ret) { connect(action, SIGNAL(triggered()), this, SLOT(onFileSave())); menu->addAction(action); //add Action to Menu Item } //"另存为"菜单项 ret = ret && makeAction(action, mb, "Save As(&A)...", 0); if(ret) { connect(action, SIGNAL(triggered()), this, SLOT(onFileSaveAs())); menu->addAction(action); //add Action to Menu Item } //水平分隔线 menu->addSeparator(); //"打印"菜单项 ret = ret && makeAction(action, mb, "Print(&P)...", Qt::CTRL + Qt::Key_P); if(ret) { connect(action, SIGNAL(triggered()),this, SLOT(onFilePrint())); menu->addAction(action); //add Action to Menu Item } menu->addSeparator(); //"退出"菜单项 ret = ret && makeAction(action, mb, "Exit(&X)", Qt::CTRL + Qt::Key_Q); if(ret) { connect(action, SIGNAL(triggered()), this, SLOT(onFileExit())); menu->addAction(action); //add Action Item to Menu } } if ( ret ) { mb->addMenu(menu); //add Menu to Menu Bar } else { delete menu; } return ret; } //“编辑”菜单 bool MainWindow::initEditMenu(QMenuBar* mb) { QMenu* menu = new QMenu("Edit(&E)", mb); bool ret = (menu != NULL); if( ret ) { QAction* action = NULL; ret = ret && makeAction(action, mb, "Undo(&U)", Qt::CTRL + Qt::Key_Z); if ( ret ) { connect(action, SIGNAL(triggered()), &mainEditor, SLOT(undo())); action->setEnabled(false); menu->addAction(action); } ret = ret && makeAction(action, mb, "Redo(&R)...", Qt::CTRL + Qt::Key_Y); if ( ret ) { connect(action, SIGNAL(triggered()), &mainEditor, SLOT(redo())); action->setEnabled(false); menu->addAction(action); } menu->addSeparator(); ret = ret && makeAction(action, mb, "Cut(&T)", Qt::CTRL + Qt::Key_X); if ( ret ) { connect(action, SIGNAL(triggered()), &mainEditor, SLOT(cut())); action->setEnabled(false); menu->addAction(action); } ret = ret && makeAction(action, mb, "Copy(&C)", Qt::CTRL + Qt::Key_C); if ( ret ) { connect(action, SIGNAL(triggered()), &mainEditor, SLOT(copy())); action->setEnabled(false); menu->addAction(action); } ret = ret && makeAction(action, mb, "Paste(&P)", Qt::CTRL + Qt::Key_V); if ( ret ) { connect(action, SIGNAL(triggered()), &mainEditor, SLOT(paste())); menu->addAction(action); } ret = ret && makeAction(action, mb, "Delete(&L)", Qt::Key_Delete); if ( ret ) { connect(action, SIGNAL(triggered()), this, SLOT(onEditDelete())); menu->addAction(action); } menu->addSeparator(); ret = ret && makeAction(action, mb, "Find(&F)...", Qt::CTRL + Qt::Key_F); if ( ret ) { connect(action, SIGNAL(triggered()), this, SLOT(onEditFind())); menu->addAction(action); } ret = ret && makeAction(action, mb, "Replace(&R)...", Qt::CTRL + Qt::Key_H); if ( ret ) { menu->addAction(action); } ret = ret && makeAction(action, mb, "Goto(&G)...", Qt::CTRL + Qt::Key_G); if ( ret ) { menu->addAction(action); } menu->addSeparator(); ret = ret && makeAction(action, mb, "Select All(&A)...", Qt::CTRL + Qt::Key_A); if ( ret ) { connect(action, SIGNAL(triggered()), &mainEditor, SLOT(selectAll())); menu->addAction(action); } } if ( ret ) { mb->addMenu(menu); } else { delete menu; } return ret; } //“格式”菜单 bool MainWindow::initFormatMenu(QMenuBar* mb) { QMenu* menu = new QMenu("Format(&O)", mb); bool ret = ( menu != NULL); if (ret) { QAction* action = NULL; ret = ret && makeAction(action, mb, "Auto Wrap(&W)", 0); if ( ret ) { menu ->addAction(action); } ret = ret && makeAction(action, mb, "Font(&F)...", 0); if ( ret ) { menu ->addAction(action); } } if ( ret ) { mb->addMenu(menu); } else { delete menu; } return ret; } //“查看”菜单 bool MainWindow::initViewMenu(QMenuBar* mb) { QMenu* menu = new QMenu("View(&V)", mb); bool ret = ( menu != NULL); if (ret) { QAction* action = NULL; ret = ret && makeAction(action, mb, "Tool Bar(&T)", 0); if ( ret ) { menu ->addAction(action); } ret = ret && makeAction(action, mb, "Status Bar(&S)", 0); if ( ret ) { menu ->addAction(action); } } if ( ret ) { mb->addMenu(menu); } else { delete menu; } return ret; } //“帮助”菜单 bool MainWindow::initHelpMenu(QMenuBar* mb) { QMenu* menu = new QMenu("Help(&H)", mb); bool ret = ( menu != NULL); if (ret) { QAction* action = NULL; ret = ret && makeAction(action, mb, "User Manual", 0); if ( ret ) { menu ->addAction(action); } ret = ret && makeAction(action, mb, "About NotePad...", 0); if ( ret ) { menu ->addAction(action); } } if ( ret ) { mb->addMenu(menu); } else { delete menu; } return ret; } //工具栏设置 bool MainWindow::initFileToolItem(QToolBar* tb) { bool ret = true; QAction* action = NULL; ret = ret && makeAction(action, tb, "New", ":/Res/pic/new.png"); if ( ret ) { connect(action, SIGNAL(triggered()), this, SLOT(onFileNew())); tb->addAction(action); } ret = ret && makeAction(action, tb, "Open", ":/Res/pic/open.png"); if ( ret ) { connect(action, SIGNAL(triggered()), this, SLOT(onFileOpen())); tb->addAction(action); } ret = ret && makeAction(action, tb, "Save", ":/Res/pic/save.png"); if ( ret ) { connect(action, SIGNAL(triggered()), this, SLOT(onFileSave())); tb->addAction(action); } ret = ret && makeAction(action, tb, "Save As", ":/Res/pic/saveas.png"); if ( ret ) { connect(action, SIGNAL(triggered()), this, SLOT(onFileSaveAs())); tb->addAction(action); } ret = ret && makeAction(action, tb, "Print", ":/Res/pic/print.png"); if ( ret ) { connect(action, SIGNAL(triggered()),this, SLOT(onFilePrint())); tb->addAction(action); } return ret; } bool MainWindow::initEditToolItem(QToolBar* tb) { bool ret = true; QAction* action = NULL; ret = ret && makeAction(action, tb, "Undo", ":/Res/pic/undo.png"); if ( ret ) { connect(action, SIGNAL(triggered()), &mainEditor, SLOT(undo())); action->setEnabled(false); tb->addAction(action); } ret = ret && makeAction(action, tb, "Redo", ":/Res/pic/redo.png"); if ( ret ) { connect(action, SIGNAL(triggered()), &mainEditor, SLOT(redo())); action->setEnabled(false); tb->addAction(action); } ret = ret && makeAction(action, tb, "Cut", ":/Res/pic/cut.png"); if ( ret ) { connect(action, SIGNAL(triggered()), &mainEditor, SLOT(cut())); action->setEnabled(false); tb->addAction(action); } ret = ret && makeAction(action, tb, "Copy", ":/Res/pic/copy.png"); if ( ret ) { connect(action, SIGNAL(triggered()), &mainEditor, SLOT(copy())); action->setEnabled(false); tb->addAction(action); } ret = ret && makeAction(action, tb, "Paste", ":/Res/pic/paste.png"); if ( ret ) { connect(action, SIGNAL(triggered()), &mainEditor, SLOT(paste())); tb->addAction(action); } ret = ret && makeAction(action, tb, "Find", ":/Res/pic/find.png"); if ( ret ) { tb->addAction(action); } ret = ret && makeAction(action, tb, "Replace", ":/Res/pic/replace.png"); if ( ret ) { tb->addAction(action); } ret = ret && makeAction(action, tb, "Goto", ":/Res/pic/goto.png"); if ( ret ) { tb->addAction(action); } return ret; } bool MainWindow::initFormatToolItem(QToolBar* tb) { bool ret = true; QAction* action = NULL; ret = ret && makeAction(action, tb, "Auto Wrap", ":/Res/pic/wrap.png"); if ( ret ) { tb->addAction(action); } ret = ret && makeAction(action, tb, "Font", ":/Res/pic/font.png"); if ( ret ) { tb->addAction(action); } return ret; } bool MainWindow::initViewToolItem(QToolBar* tb) { bool ret = true; QAction* action = NULL; ret = ret && makeAction(action, tb, "Tool Bar", ":/Res/pic/tool.png"); if ( ret ) { tb->addAction(action); } ret = ret && makeAction(action, tb, "Status Bar", ":/Res/pic/status.png"); if ( ret ) { tb->addAction(action); } return ret; } //生成菜单项(第1个参数是菜单项对象,第2个参数为父组件,第3个参数为显示文本,第4个参数为快捷键) bool MainWindow::makeAction(QAction*& action, QWidget* parent, QString text, int key) { bool ret = true; action = new QAction(text, parent); //设置parent if(action != NULL) { action->setShortcut(QKeySequence(key)); //设置快捷键 } else { ret = false; } return ret; } //生成工具栏中的各按钮 bool MainWindow::makeAction(QAction*& action, QWidget* parent, QString tip, QString icon) { bool ret = true; action = new QAction("", parent); if( action != NULL ) { action ->setToolTip(tip); action->setIcon(QIcon(icon)); } else { ret = false; } return ret; } MainWindow::~MainWindow() { }
//MainWindowSlots.cpp //与上例相同
4. 小结
(1)QPalette是Qt中标识颜色信息的数据结构
(2)窗口组件内部都拥有QPalette对象
(3)重新设置组件调色板的值能够改变特定区域的颜色
(4)QPalette对象是定制组件外观的重要角色。
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