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271 lines
8.5 KiB
C++
271 lines
8.5 KiB
C++
#include "multiselectcombobox.h"
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#include "qscrollbar.h"
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#include <QLineEdit>
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#include <QCheckBox>
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#include <QEvent>
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#include "mycheckbox.h"
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#include <QScrollBar>
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MultiSelectComboBox::MultiSelectComboBox(QWidget *parent)
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: QComboBox(parent)
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, hidden_flag_(true)
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, show_flag_(false)
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{
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list_widget_ = new QListWidget();
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line_edit_ = new QLineEdit();
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search_bar_ = new QLineEdit();
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/* 设置搜索框 */
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QListWidgetItem* currentItem = new QListWidgetItem(list_widget_);
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// 设置搜索框提示信息.
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search_bar_->setPlaceholderText("Search.........");
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// 显示清除按钮.
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search_bar_->setClearButtonEnabled(true);
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list_widget_->addItem(currentItem);
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list_widget_->setItemWidget(currentItem, search_bar_);
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/* 设置文本框 */
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// 设为只读，因为该输入框只用来显示选中的选项，称为文本框更合适些.
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line_edit_->setReadOnly(true);
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// 把当前对象安装(或注册)为事件过滤器，当前也称为过滤器对象。事件过滤器通常在构造函数中进行注册.
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line_edit_->installEventFilter(this);
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// 设置禁用样式，因为不受样式表控制，临时这样解决.
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line_edit_->setStyleSheet("QLineEdit:disabled{background:rgb(233,233,233);}");
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this->setModel(list_widget_->model());
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this->setView(list_widget_);
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this->setLineEdit(line_edit_);
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connect(search_bar_, SIGNAL(textChanged(const QString&)), this, SLOT(onSearch(const QString&)));
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connect(this, static_cast<void (QComboBox::*)(int)>(&QComboBox::activated), this, &MultiSelectComboBox::itemClicked);
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}
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MultiSelectComboBox::~MultiSelectComboBox()
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{
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}
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// 隐藏下拉框.
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void MultiSelectComboBox::hidePopup()
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{
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show_flag_ = false;
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int width = this->width();
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int height = this->height();
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int x = QCursor::pos().x() - mapToGlobal(geometry().topLeft()).x() + geometry().x();
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int y = QCursor::pos().y() - mapToGlobal(geometry().topLeft()).y() + geometry().y();
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if (x >= 0 && x <= width && y >= this->height() && y <= height + this->height())
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{
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}
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else
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{
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this->scroll_value = this->list_widget_->verticalScrollBar()->value();
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QComboBox::hidePopup();
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}
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}
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// 添加一条选项.
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void MultiSelectComboBox::addItem(const QString& _text, const QVariant& _variant)
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{
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Q_UNUSED(_variant);
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QListWidgetItem* item = new QListWidgetItem(list_widget_);
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MyCheckBox* checkbox = new MyCheckBox(this);
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checkbox->setText(_text);
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list_widget_->addItem(item);
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list_widget_->setItemWidget(item, checkbox);
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connect(checkbox, &MyCheckBox::stateChanged, this, &MultiSelectComboBox::stateChange);
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}
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// 添加多条选项.
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void MultiSelectComboBox::addItems(const QStringList& _text_list)
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{
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for (const auto& text_one : _text_list)
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{
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addItem(text_one);
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}
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}
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// 返回当前选中选项.
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QStringList MultiSelectComboBox::currentText()
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{
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QStringList text_list;
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if (!line_edit_->text().isEmpty())
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{
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// 以;为分隔符分割字符串.
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text_list = line_edit_->text().split(':');
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}
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return text_list;
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}
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// 返回当前选项条数.
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int MultiSelectComboBox::count() const
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{
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int count = list_widget_->count() - 1;
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if (count < 0)
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{
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count = 0;
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}
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return count;
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}
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// 设置搜索框默认文字.
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void MultiSelectComboBox::SetSearchBarPlaceHolderText(const QString _text)
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{
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search_bar_->setPlaceholderText(_text);
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}
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// 设置文本框默认文字.
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void MultiSelectComboBox::SetPlaceHolderText(const QString& _text)
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{
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line_edit_->setPlaceholderText(_text);
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}
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// 下拉框状态恢复默认（所有选项都恢复为未选中状态）.
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void MultiSelectComboBox::ResetSelection()
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{
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int count = list_widget_->count();
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for (int i = 1; i < count; i++)
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{
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// 获取对应位置的QWidget对象.
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QWidget *widget = list_widget_->itemWidget(list_widget_->item(i));
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// 将QWidget对象转换成对应的类型.
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MyCheckBox *check_box = static_cast<MyCheckBox*>(widget);
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check_box->setChecked(false);
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}
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}
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// 清空所有内容（选项内容全部清空）.
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void MultiSelectComboBox::clear()
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{
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line_edit_->clear();
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list_widget_->clear();
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QListWidgetItem* currentItem = new QListWidgetItem(list_widget_);
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search_bar_->setPlaceholderText("Search.........");
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search_bar_->setClearButtonEnabled(true);
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list_widget_->addItem(currentItem);
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list_widget_->setItemWidget(currentItem, search_bar_);
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SetSearchBarHidden(hidden_flag_);
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connect(search_bar_, SIGNAL(textChanged(const QString&)), this, SLOT(onSearch(const QString&)));
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}
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// 文本框内容清空（选项内容不清空，所有选项都恢复为未选中状态，文本框清空）.
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void MultiSelectComboBox::TextClear()
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{
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line_edit_->clear();
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ResetSelection();
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}
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// 设置选中文本--单.
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void MultiSelectComboBox::setCurrentText(const QString& _text)
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{
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int count = list_widget_->count();
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for (int i = 1; i < count; i++)
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{
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// 获取对应位置的QWidget对象.
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QWidget *widget = list_widget_->itemWidget(list_widget_->item(i));
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// 将QWidget对象转换成对应的类型.
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MyCheckBox *check_box = static_cast<MyCheckBox*>(widget);
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if (_text.compare(check_box->text()))
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check_box->setChecked(true);
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}
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}
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// 设置选中文本--多.
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void MultiSelectComboBox::setCurrentText(const QStringList& _text_list)
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{
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int count = list_widget_->count();
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for (int i = 1; i < count; i++)
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{
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// 获取对应位置的QWidget对象.
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QWidget *widget = list_widget_->itemWidget(list_widget_->item(i));
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// 将QWidget对象转换成对应的类型.
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MyCheckBox *check_box = static_cast<MyCheckBox*>(widget);
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if (_text_list.contains(check_box->text()))
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check_box->setChecked(true);
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}
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}
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// 设置搜索框是否禁用.
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void MultiSelectComboBox::SetSearchBarHidden(bool _flag)
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{
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hidden_flag_ = _flag;
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list_widget_->item(0)->setHidden(hidden_flag_);
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}
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bool MultiSelectComboBox::eventFilter(QObject *watched, QEvent *event)
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{
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// 设置点击输入框也可以弹出下拉框.
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//qDebug() << event->type();
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if (watched == line_edit_ && event->type() == QEvent::MouseButtonRelease && this->isEnabled())
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{
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if (show_flag_)
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hidePopup();
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else
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showPopup();
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show_flag_ = !show_flag_;
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return true;
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}
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return false;
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}
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void MultiSelectComboBox::wheelEvent(QWheelEvent *event)
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{
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// 禁用QComboBox默认的滚轮事件.
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Q_UNUSED(event);
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}
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void MultiSelectComboBox::keyPressEvent(QKeyEvent *event)
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{
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QComboBox::keyPressEvent(event);
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}
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// 槽函数：文本框文本变化.
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void MultiSelectComboBox::stateChange(int _row)
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{
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Q_UNUSED(_row);
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// QString selected_data("");
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selected_data = "";
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int count = list_widget_->count();
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for (int i = 1; i < count; i++)
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{
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QWidget *widget = list_widget_->itemWidget(list_widget_->item(i));
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MyCheckBox *check_box = static_cast<MyCheckBox*>(widget);
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if (check_box->isChecked())
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{
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selected_data.append(check_box->text()).append(";");
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}
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}
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selected_data.chop(1);
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if (!selected_data.isEmpty())
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{
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line_edit_->setText(selected_data);
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}
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else
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{
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line_edit_->clear();
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}
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line_edit_->setToolTip(selected_data);
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emit selectionChange(selected_data);
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}
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// 槽函数：搜索框文本变化
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void MultiSelectComboBox::onSearch(const QString& _text)
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{
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for (int i = 1; i < list_widget_->count(); i++)
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{
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MyCheckBox *check_box = static_cast<MyCheckBox*>(list_widget_->itemWidget(list_widget_->item(i)));
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// 文本匹配则显示，反之隐藏
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//Qt::CaseInsensitive模糊查询.
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if (check_box->text().contains(_text, Qt::CaseInsensitive))
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list_widget_->item(i)->setHidden(false);
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else
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list_widget_->item(i)->setHidden(true);
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}
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}
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// 槽函数：点击下拉框选项
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void MultiSelectComboBox::itemClicked(int _index)
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{
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if (_index != 0)
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{
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MyCheckBox *check_box = static_cast<MyCheckBox*>(list_widget_->itemWidget(list_widget_->item(_index)));
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check_box->setChecked(!check_box->isChecked());
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}
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}
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void MultiSelectComboBox::showPopup()
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{
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QComboBox::showPopup();
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this->list_widget_->verticalScrollBar()->setSliderPosition(this->scroll_value);
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// this->list_widget_->verticalScrollBar()->setValue(this->scroll_value);
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QWidget *popup = this->findChild<QFrame*>();
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popup->move(popup->x(), popup->y() + 5);
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//激活当前下拉框对象.
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list_widget_->activateWindow();
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}
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