引言

當根據數據來創建控件并布局時，如果數據更新，那么之前創建的控件便需要刪除后重新創建布局。該文主要說明將原來的布局和控件刪除，重新創建并布局。

示例

先看一下ui文件：

下面是實現代碼：

void StatusViewDialog::initSourcesView() {deleteSourcesOrignalLayoutCtrls();QWidget *sourcesWidget = ui->scrollAreaWidgetContents;QVBoxLayout *vLayout = new QVBoxLayout(sourcesWidget);vLayout->setSpacing(5);vLayout->setContentsMargins(5,5,5,5);int page = 12;QLabel *curLabel = new QLabel(QStringLiteral("當前頁："));QLineEdit *curEdit = new QLineEdit(QString::number(page));curEdit->setReadOnly(true);curEdit->setFixedWidth(40);QLabel *totalLabel = new QLabel(QStringLiteral("總頁數："));QLineEdit *totalEdit = new QLineEdit(QString::number(page));totalEdit->setReadOnly(true);totalEdit->setFixedWidth(40);QHBoxLayout *smallLayouth = new QHBoxLayout;smallLayouth->addWidget(curLabel);smallLayouth->addWidget(curEdit);smallLayouth->addWidget(totalLabel);smallLayouth->addWidget(totalEdit);smallLayouth->addStretch();vLayout->addLayout(smallLayouth);//設置控件樣式QString strLabelStyle = "QLabel{font-size: 17px;font-family: Microsoft YaHei;color: #FFFFFF;}";curLabel->setStyleSheet(strLabelStyle);totalLabel->setStyleSheet(strLabelStyle);QString strEditStyle = "QLineEdit{font-size: 17px;font-family: Microsoft YaHei;color: #FFFFFF;""border: 1px solid #01B5EF;border-radius: 2px;background: rgba(8, 7, 91, 0.08);}";curEdit->setStyleSheet(strEditStyle);totalEdit->setStyleSheet(strEditStyle);QList<QHBoxLayout*> hlayoutList;for (int i = 0 ; i < 3 ; ++i) {QLabel * inputLabel = new QLabel(QStringLiteral("幼兒園："));QLineEdit *inputEdit = new QLineEdit(QStringLiteral("小孩子"));inputEdit->setReadOnly(true);inputEdit->setFixedWidth(150);QLabel *onlineLabel = new QLabel(QStringLiteral("是小孩子："));QString boolStr = "true";QLineEdit *onlineEdit = new QLineEdit(boolStr);onlineEdit->setReadOnly(true);onlineEdit->setFixedWidth(80);QLabel *stateLabel = new QLabel(QStringLiteral("能獨立："));boolStr = "false";QLineEdit *stateEdit = new QLineEdit(boolStr);stateEdit->setReadOnly(true);stateEdit->setFixedWidth(80);QLabel *modeLabel = new QLabel(QStringLiteral("可愛不："));QLineEdit *modeEdit = new QLineEdit(QStringLiteral("可愛"));modeEdit->setReadOnly(true);modeEdit->setFixedWidth(180);QLabel *nameLabel = new QLabel(QStringLiteral("天才："));QLineEdit *nameEdit = new QLineEdit(QStringLiteral("天才"));nameEdit->setReadOnly(true);nameEdit->setFixedWidth(200);QLabel *tempretrueLabel = new QLabel(QStringLiteral("溫度："));qreal tempretrue = 12.12;QLineEdit *tempretrueEdit = new QLineEdit(QString::number(tempretrue));tempretrueEdit->setReadOnly(true);tempretrueEdit->setFixedWidth(50);inputLabel->setStyleSheet(strLabelStyle);onlineLabel->setStyleSheet(strLabelStyle);stateLabel->setStyleSheet(strLabelStyle);modeLabel->setStyleSheet(strLabelStyle);nameLabel->setStyleSheet(strLabelStyle);tempretrueLabel->setStyleSheet(strLabelStyle);inputEdit->setStyleSheet(strEditStyle);onlineEdit->setStyleSheet(strEditStyle);stateEdit->setStyleSheet(strEditStyle);modeEdit->setStyleSheet(strEditStyle);nameEdit->setStyleSheet(strEditStyle);tempretrueEdit->setStyleSheet(strEditStyle);QHBoxLayout *hLayout = new QHBoxLayout;hLayout->addWidget(inputLabel);hLayout->addWidget(inputEdit);hLayout->addWidget(onlineLabel);hLayout->addWidget(onlineEdit);hLayout->addWidget(stateLabel);hLayout->addWidget(stateEdit);hLayout->addWidget(modeLabel);hLayout->addWidget(modeEdit);hLayout->addWidget(nameLabel);hLayout->addWidget(nameEdit);hLayout->addWidget(tempretrueLabel);hLayout->addWidget(tempretrueEdit);vLayout->addLayout(hLayout);}adjustScrollWidgetHeight(3,ui->scrollAreaWidgetContents); }void StatusViewDialog::initSeatsView() {deleteSeatsOrignalLayoutCtrls();int row = 0;QWidget *widget = ui->scrollAreaWidgetContents_2;QVBoxLayout *vlayout = new QVBoxLayout(widget);vlayout->setSpacing(5);vlayout->setContentsMargins(5,5,5,5);QList<QHBoxLayout*> everyHlayoutList;for (int i = 0 ; i < 4 ; ++i) {QLabel *curLabel = new QLabel(QStringLiteral("當前頁："));int page = 11;QLineEdit *curEdit = new QLineEdit(QString::number(page));curEdit->setReadOnly(true);curEdit->setFixedWidth(40);QLabel *totalLabel = new QLabel(QStringLiteral("總頁數："));QLineEdit *totalEdit = new QLineEdit(QString::number(page));totalEdit->setReadOnly(true);totalEdit->setFixedWidth(40);QLabel *unidNameLabel = new QLabel(QStringLiteral("名稱："));QLineEdit *unidNameEdit = new QLineEdit(QStringLiteral("席位"));unidNameEdit->setReadOnly(true);unidNameEdit->setFixedWidth(130);QLabel *unisIdLabel = new QLabel(QStringLiteral("大小："));QLineEdit *unisIdEdit = new QLineEdit(QStringLiteral("23"));unisIdEdit->setReadOnly(true);unisIdEdit->setFixedWidth(300);QLabel *userNameLabel = new QLabel(QStringLiteral("用戶名："));QLineEdit *userNameEdit = new QLineEdit(QStringLiteral("深度"));userNameEdit->setReadOnly(true);userNameEdit->setFixedWidth(150);QString strLabelStyle = "QLabel{font-size: 17px;font-family: Microsoft YaHei;color: #FFFFFF;}";QString strEditStyle = "QLineEdit{font-size: 17px;font-family: Microsoft YaHei;color: #FFFFFF;""border: 1px solid #01B5EF;border-radius: 2px;background: rgba(8, 7, 91, 0.08);}";curLabel->setStyleSheet(strLabelStyle);totalLabel->setStyleSheet(strLabelStyle);unidNameLabel->setStyleSheet(strLabelStyle);unisIdLabel->setStyleSheet(strLabelStyle);userNameLabel->setStyleSheet(strLabelStyle);curEdit->setStyleSheet(strEditStyle);totalEdit->setStyleSheet(strEditStyle);unidNameEdit->setStyleSheet(strEditStyle);unisIdEdit->setStyleSheet(strEditStyle);userNameEdit->setStyleSheet(strEditStyle);QHBoxLayout *hlayout1 = new QHBoxLayout;hlayout1->addWidget(curLabel);hlayout1->addWidget(curEdit);hlayout1->addWidget(totalLabel);hlayout1->addWidget(totalEdit);hlayout1->addWidget(unidNameLabel);hlayout1->addWidget(unidNameEdit);hlayout1->addWidget(unisIdLabel);hlayout1->addWidget(unisIdEdit);hlayout1->addWidget(userNameLabel);hlayout1->addWidget(userNameEdit);everyHlayoutList.append(hlayout1);++row;QString strGroupStyle = "QGroupBox{border: 1px solid #01B5EF;border-radius:2px;margin-top: 0.5px;}""QGroupBox::title{subcontrol-origin: margin;subcontrol-position: top left;""left: 10px;margin-left: 2px;padding: 0 0px;}";QGroupBox *groupBox = new QGroupBox;groupBox->setStyleSheet(strGroupStyle);QList<QHBoxLayout*> hlayoutList;for (int j = 0 ; j < 3; ++j) {QHBoxLayout *layoutStatus = new QHBoxLayout;hlayoutList.append(layoutStatus);QLabel *ipLabel = new QLabel(QStringLiteral("IP："));QLineEdit *ipEdit = new QLineEdit(QStringLiteral("129.128.0.1"));ipEdit->setReadOnly(true);QLabel *tempretureLabel = new QLabel(QStringLiteral("溫度："));QLineEdit *tempretureEdit = new QLineEdit(QStringLiteral("24"));tempretureEdit->setReadOnly(true);QLabel *onlineLabel = new QLabel(QStringLiteral("是否在線："));QString temp = "true";QLineEdit *onlineEdit = new QLineEdit(temp);onlineEdit->setReadOnly(true);ipLabel->setStyleSheet(strLabelStyle);tempretureLabel->setStyleSheet(strLabelStyle);onlineLabel->setStyleSheet(strLabelStyle);ipEdit->setStyleSheet(strEditStyle);tempretureEdit->setStyleSheet(strEditStyle);onlineEdit->setStyleSheet(strEditStyle);layoutStatus->addWidget(ipLabel);layoutStatus->addWidget(ipEdit);layoutStatus->addWidget(tempretureLabel);layoutStatus->addWidget(tempretureEdit);layoutStatus->addWidget(onlineLabel);layoutStatus->addWidget(onlineEdit);row++;}QVBoxLayout *vGroupboxLayout = new QVBoxLayout(groupBox);for (int i = 0 ; i < hlayoutList.size() ; ++i) {vGroupboxLayout->addLayout(hlayoutList[i]);}QHBoxLayout *hGroupLayout = new QHBoxLayout;hGroupLayout->addWidget(groupBox);everyHlayoutList.append(hGroupLayout);}for (int j = 0 ; j < everyHlayoutList.size() ; ++j) {vlayout->addLayout(everyHlayoutList[j]);}adjustScrollWidgetHeight(row,ui->scrollAreaWidgetContents_2); }void StatusViewDialog::deleteSourcesOrignalLayoutCtrls() {if (ui->scrollAreaWidgetContents->layout() != nullptr) {QLayout *oldLayout = ui->scrollAreaWidgetContents->layout();delete oldLayout;}QList<QWidget*> widgetList = ui->scrollAreaWidgetContents->findChildren<QWidget*>();foreach (QWidget* ctrl, widgetList) {delete ctrl;} }void StatusViewDialog::deleteSeatsOrignalLayoutCtrls() {if (ui->scrollAreaWidgetContents_2->layout() != nullptr) {delete ui->scrollAreaWidgetContents_2->layout();}//現刪除groupbox,然后刪除窗口上剩余的控件QList<QGroupBox*> groupBox = ui->scrollAreaWidgetContents_2->findChildren<QGroupBox*>();foreach (QGroupBox *gb, groupBox) {delete gb;}//刪除其它的標簽和行編輯器QList<QWidget*> widgetList = ui->scrollAreaWidgetContents_2->findChildren<QWidget*>();foreach (QWidget* ctrl, widgetList) {delete ctrl;} }void StatusViewDialog::adjustScrollWidgetSize(QWidget *widget,QWidget *changedWidget) {QGridLayout *gridLayout = new QGridLayout(widget);//使tab頁中的窗口和tab頁一樣大gridLayout->setContentsMargins(0,0,0,0);gridLayout->addWidget(changedWidget,0,0,1,1); }void StatusViewDialog::adjustScrollWidgetHeight(int num,QWidget *widget) {int height = (num + 1) * 35;//平均每行的高度為35widget->setFixedHeight(height); }

這里是tabwidget控件中創建控件并布局，先刪除之前的控件和布局，然后重新創建控件并布局。這里刪除的時候先獲取之前的布局，然后刪除布局，再刪除控件，控件刪除時是按照類型來刪除的，主要由其父窗口來看類型，找到某一類的控件，然后返回對應的列表，然后刪除，另外創建控件后根據控件的數量調整布局所在窗口的大小。

總結

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