1 //2.5 控件
2 //2.51 按钮组(Buttons)
3 /*
4 Radio Button //单选按钮
5 Check Box//复选框
6 Dialog Button Box//对话框按钮盒
7 */
8 //main.cpp
9 #include "mywidget.h"
10 #include <QApplication>
11
12 int main(int argc, char *argv[])
13 {
14 QApplication a(argc, argv);
15 MyWidget w;//创建一个MyWidget对象
16 w.setGeometry(100,100,200,120);//设置其长宽
17 w.show();
18
19 return a.exec();
20 }
21 //mywidget.h
22 #include "mywidget.h"
23 #include <qapplication.h>
24 #include <qpushbutton.h>//用到了按钮，因此添加相应的头文件
25 #include <qfont.h>
26 MyWidget::MyWidget(QWidget *parent)
27 : QWidget(parent)
28 {
29 setMinimumSize(200,120);
30 setMaximumSize(200,120);
31 QPushButton *quit = new QPushButton("Quit",this);//先记住
32 quit->setGeometry(62,40,75,30);
33 quit->setFont(QFont("Times",18,QFont::Bold));
34 connect(quit,SIGNAL(clicked()),qApp,SLOT(quit()));
35 }
36
37 MyWidget::~MyWidget()
38 {
39
40 }
41 //2.52 输入部件组(Input Widgets)
42 /*
43 combo box 组合框
44 spin box 数字显示框
45 dial 拨号
46 scroll bar 滚动条
47 slider 滑块
48 key sequence edit 按键序列编辑框
49 */
50 //QDate Time
51 QLabel * datalabel = new QLabel();
52 QDateTime * datatime = new QDateTime(QDateTime::currentDateTime());
53 datalabel->setText(datatime->date().toString());
54 datalabel->show();
55 //QTime
56 QTimer *time_clock = new QTimer(parent);
57 connect(time_clock,SIGNAL(timeout()),this,SLOT(slottimedone()));//定时时间一到发送timeout()信号，从而触发slottimedone()槽去完成某件事情
58 start(int time)//每隔time秒触发定时
59 setSingleShot(true)//仅启动一次
60 stop()//关掉定时器
61 time_clock->start(2000)//示例
62 //2.53 显示控件组(Display Widgets)
63 LCD Number//液晶数字
64 Progress Bar//进度条
65 OpenGL widget//开放式图形库工具
66 QQuickWidget//嵌入QML工具
67
68 Text Browser 介绍
69 属性见 P48
70 SLOTS：
71 virtual void backward()
72 virtual void forward()
73 virtual void home()
74
75 //widget.h
76 #ifndef WIDGET_H
77 #define WIDGET_H
78
79 #include <QWidget>
80 #include <QTreeWidgetItem>
81 namespace Ui {
82 class Widget;
83 }
84
85 class Widget : public QWidget
86 {
87 Q_OBJECT
88
89 public:
90 explicit Widget(QWidget *parent = 0);
91 void init();
92 ~Widget();
93 void updateParentItem(QTreeWidgetItem* item);
94 public slots:
95 void treeItemChanged (QTreeWidgetItem* item,int column);
96
97 private:
98 Ui::Widget *ui;
99 };
100
101 #endif // WIDGET_H
102
103 //widget.cpp
104 #include "widget.h"
105 #include "ui_widget.h"
106
107 Widget::Widget(QWidget *parent) :
108 QWidget(parent),
109 ui(new Ui::Widget)
110 {
111 init();//?
112 connect(ui->treeWidget,SIGNAL(itemChanged(QTreeWidgetItem*,int)),this,SLOT(treeItemChanged(QTreeWidgetItem*,int)));//SIGNAL & SLot
113 ui->setupUi(this);
114 }
115
116 Widget::~Widget()
117 {
118 delete ui;
119 }
120 void Widget::init()
121 {
122 ui->treeWidget->clear();
123 //1
124 QTreeWidgetItem *group1 = new QTreeWidgetItem(ui->treeWidget);
125 group1->setText(0,"group1");
126 group1->setFlags(Qt::ItemIsUserCheckable|Qt::ItemIsEnabled|Qt::ItemIsSelectable);
127 group1->setCheckState(0,Qt::Unchecked);
128 QTreeWidgetItem *subItem11 = new QTreeWidgetItem(group1);
129 subItem11->setFlags(Qt::ItemIsUserCheckable|Qt::ItemIsEnabled|Qt::ItemIsSelectable);
130 subItem11->setText(0,"subItem11");
131 subItem11->setCheckState(0,Qt::Unchecked);
132 QTreeWidgetItem *subItem12 = new QTreeWidgetItem(group1);
133 subItem12->setFlags(Qt::ItemIsUserCheckable|Qt::ItemIsEnabled|Qt::ItemIsSelectable);
134 subItem12->setText(0,"subItem12");
135 subItem12->setCheckState(0,Qt::Unchecked);
136 QTreeWidgetItem *subItem13 = new QTreeWidgetItem(group1);
137 subItem13->setFlags(Qt::ItemIsUserCheckable|Qt::ItemIsEnabled|Qt::ItemIsSelectable);
138 subItem13->setText(0,"subItem13");
139 subItem13->setCheckState(0,Qt::Unchecked);
140 //2
141 QTreeWidgetItem *group2 = new QTreeWidgetItem(ui->treeWidget);
142 group2->setText(0,"group2");
143 group2->setFlags(Qt::ItemIsUserCheckable|Qt::ItemIsEnabled|Qt::ItemIsSelectable);
144 group2->setCheckState(0,Qt::Unchecked);
145 QTreeWidgetItem *subItem21 = new QTreeWidgetItem(group2);
146 subItem21->setFlags(Qt::ItemIsUserCheckable|Qt::ItemIsEnabled|Qt::ItemIsSelectable);
147 subItem21->setText(0,"subItem21");
148 subItem21->setCheckState(0,Qt::Unchecked);
149 QTreeWidgetItem *subItem22 = new QTreeWidgetItem(group2);
150 subItem22->setFlags(Qt::ItemIsUserCheckable|Qt::ItemIsEnabled|Qt::ItemIsSelectable);
151 subItem22->setText(0,"subItem22");
152 subItem22->setCheckState(0,Qt::Unchecked);
153 QTreeWidgetItem *subItem23 = new QTreeWidgetItem(group2);
154 subItem23->setFlags(Qt::ItemIsUserCheckable|Qt::ItemIsEnabled|Qt::ItemIsSelectable);
155 subItem23->setText(0,"subItem23");
156 subItem23->setCheckState(0,Qt::Unchecked);
157 }
158
159 void Widget::treeItemChanged(QTreeWidgetItem *item, int column)
160 {
161 QString itemText = item->text(0);
162 if (Qt::Checked==item->checkState(0))
163 {
164 QTreeWidgetItem* parent = item->parent();
165 int count=item->childCount();
166 if(count>0)
167 {
168 for(int i=0;i<count;i++)
169 {
170 item->child(i)->setCheckState(0,Qt::Checked);
171 }
172 }
173 else
174 {
175 updateParentItem(item);
176 }
177 }
178 else if(Qt::Unchecked == item->checkState(0))
179 {
180 int count = item->childCount();
181 if(count>0)
182 {
183 for(int i=0;i<count;i++)
184 {
185 item->child(i)->setCheckState(0,Qt::Unchecked);
186 }
187 }
188 else
189 {
190 updateParentItem(item);
191 }
192 }
193 }
194 void Widget::updateParentItem(QTreeWidgetItem *item)
195 {
196 QTreeWidgetItem *parent = item->parent();
197 if(parent == NULL)
198 {
199 return;
200 }
201 int selectedCount = 0;
202 int childCount = parent->childCount();
203 for(int i =0;i<childCount;++i)
204 {
205 QTreeWidgetItem* childItem = parent->child(i);
206 if(childItem->checkState(0)==Qt::Checked)
207 {
208 selectedCount++;
209 }
210 }
211 if(selectedCount<=0)
212 {
213 parent->setCheckState(0,Qt::Unchecked);
214 }
215 else if(selectedCount>0&&selectedCount<childCount)
216 {
217 parent->setCheckState(0,Qt::PartiallyChecked);
218 }
219 else if(selectedCount == childCount)
220 {
221 parent->setCheckState(0,Qt::Checked);
222 }
223 }
224
225
226 //main.cpp
227 #include "widget.h"
228 #include <QApplication>
229
230 int main(int argc, char *argv[])
231 {
232 QApplication a(argc, argv);
233 Widget w;
234 w.show();
235
236 return a.exec();
237 }
238
239
240 //dialog.h
241 private slots:
242 void on_lineEdit_textChanged();//定义一个槽；名字的定义有一定规则
243 //dialog.cpp
244 Dialog::Dialog(QWidget *parent) :
245 QDialog(parent),
246 ui(new Ui::Dialog)
247 {
248 ui->setupUi(this);
249 QRegExp regExp("[A-Za-z][1-9][0-9]{0,2}");//建立一个正则表达式
250 ui->lineEdit->setValidator(new QRegExpValidator(regExp,this));//先记住如何使用
251 connect(ui->okButton,SIGNAL(clicked(bool)),this,SLOT(accept()));//信号与槽的连接
252 connect(ui->cancelButton,SIGNAL(clicked(bool)),this,SLOT(reject()));
253 }
254 void Dialog::on_lineEdit_textChanged()//定义槽函数
255 {
256 ui->okButton->setEnabled(ui->lineEdit->hasAcceptableInput());//使用lineEdit输入文本的有效性决定okButton的可操作性
257 }