Qt中樹形控件Tree Widget的使用方法匯總
最近需要用到Tree Widget樹形控件,現將自己的一些理解記錄下來。
Tree Widget在項目控件組(Item Widgets)裡面可以找到。這種控件其實有時還是很有用處的,我主要利用的是帶有復選框的樹形控件。結果如圖所示;
當選中頂層的樹形節點時,子節點全部被選中;當取消選擇頂層樹形節點時,子節點的選中狀態將全部被取消,二當選中子節點是,父節點顯示部分選中的狀態。
幾個主要的函數:
setCheckState設置復選框;
ItemIsUserCheckable 項目上是否有復選框
ItemIsEnabled 項目上是否沒有被禁用(Enabled可用/Disabled禁用)
ItemIsSelectable 項目是否可以選中
代碼:
在mainwindow.h中插入一下代碼:
void init(); void updateParentItem(QTreeWidgetItem *item); public slots: void treeItemChanged(QTreeWidgetItem* item,int column);
在mainwindow構造函數中添加:
init(); connect(ui->treeWidget,SIGNAL(itemChanged(QTreeWidgetItem*,int)),this,SLOT(treeItemChanged(QTreeWidgetItem*,int)));
init函數的實現;
QTreeWidgetItem* group1=new QTreeWidgetItem(ui->treeWidget); group1->setText(0,"group1"); group1->setFlags(Qt::ItemIsUserCheckable|Qt::ItemIsEnabled|Qt::ItemIsSelectable); group1->setCheckState(0,Qt::Unchecked); QTreeWidgetItem* subItem11=new QTreeWidgetItem(group1); subItem11->setFlags(Qt::ItemIsUserCheckable|Qt::ItemIsEnabled|Qt::ItemIsSelectable); subItem11->setText(0,"subItem11"); subItem11->setCheckState(0,Qt::Unchecked); QTreeWidgetItem* subItem12=new QTreeWidgetItem(group1); subItem12->setFlags(Qt::ItemIsUserCheckable|Qt::ItemIsEnabled|Qt::ItemIsSelectable); subItem12->setText(0,"subItem12"); subItem12->setCheckState(0,Qt::Unchecked); QTreeWidgetItem* subItem13=new QTreeWidgetItem(group1); subItem13->setFlags(Qt::ItemIsUserCheckable|Qt::ItemIsEnabled|Qt::ItemIsSelectable); subItem13->setText(0,"subItem11"); subItem13->setCheckState(0,Qt::Unchecked); QTreeWidgetItem* subItem14=new QTreeWidgetItem(group1); subItem14->setFlags(Qt::ItemIsUserCheckable|Qt::ItemIsEnabled|Qt::ItemIsSelectable); subItem14->setText(0,"subItem12"); subItem14->setCheckState(0,Qt::Unchecked); QTreeWidgetItem* group2=new QTreeWidgetItem(ui->treeWidget); group2->setText(0,"group2"); group2->setFlags(Qt::ItemIsUserCheckable|Qt::ItemIsEnabled|Qt::ItemIsSelectable); group2->setCheckState(0,Qt::Unchecked); QTreeWidgetItem* subItem1=new QTreeWidgetItem(group2); subItem1->setFlags(Qt::ItemIsUserCheckable|Qt::ItemIsEnabled|Qt::ItemIsSelectable); subItem1->setText(0,"subItem11"); subItem1->setCheckState(0,Qt::Unchecked); QTreeWidgetItem* subItem2=new QTreeWidgetItem(group2); subItem2->setFlags(Qt::ItemIsUserCheckable|Qt::ItemIsEnabled|Qt::ItemIsSelectable); subItem2->setText(0,"subItem12"); subItem2->setCheckState(0,Qt::Unchecked); QTreeWidgetItem* subItem3=new QTreeWidgetItem(group2); subItem3->setFlags(Qt::ItemIsUserCheckable|Qt::ItemIsEnabled|Qt::ItemIsSelectable); subItem3->setText(0,"subItem11"); subItem3->setCheckState(0,Qt::Unchecked); QTreeWidgetItem* subItem4=new QTreeWidgetItem(group2); subItem4->setFlags(Qt::ItemIsUserCheckable|Qt::ItemIsEnabled|Qt::ItemIsSelectable); subItem4->setText(0,"subItem12"); subItem4->setCheckState(0,Qt::Unchecked); QTreeWidgetItem* group3=new QTreeWidgetItem(ui->treeWidget); group3->setText(0,"group3"); group3->setFlags(Qt::ItemIsAutoTristate|Qt::ItemIsEnabled|Qt::ItemIsSelectable); group3->setCheckState(0,Qt::Unchecked); QTreeWidgetItem* subItem111=new QTreeWidgetItem(group3); subItem111->setFlags(Qt::ItemIsAutoTristate|Qt::ItemIsEnabled|Qt::ItemIsSelectable); subItem111->setText(0,"subItem111"); subItem111->setCheckState(0,Qt::Unchecked); QTreeWidgetItem* subItem112=new QTreeWidgetItem(group3); subItem112->setFlags(Qt::ItemIsAutoTristate|Qt::ItemIsEnabled|Qt::ItemIsSelectable); subItem112->setText(0,"subItem112"); subItem112->setCheckState(0,Qt::Unchecked);
treeItemChanged函數的實現;
QString itemText=item->text(0); //選中 if(Qt::Checked ==item->checkState(0))//全選check打勾 { QTreeWidgetItem* parent=item->parent();//定義一個節點 int count=item->childCount();//子節點的數目 if(count>0) { for(int i=0;i<count;i++) { //子節點也選中 item->child(i)->setCheckState(0,Qt::Checked); } } else { //是子節點 updateParentItem(item); } } else if(Qt::Unchecked==item->checkState(0))//存在未選中 { int count=item->childCount(); if(count>0) { for(int i=0;i<count;i++) { item->child(i)->setCheckState(0,Qt::Unchecked); } } else { updateParentItem(item); } }
updateParentItem 函數的實現;
QTreeWidgetItem* parent=item->parent(); if(parent==NULL) { return; } int selectedCount =0; int childCount =parent->childCount(); for(int i=0;i<childCount;i++) { QTreeWidgetItem* childItem=parent->child(i); if(childItem->checkState(0)==Qt::Checked) { selectedCount++; } } if(selectedCount<=0) { parent->setCheckState(0,Qt::Unchecked); } else if(selectedCount>0&&selectedCount<childCount) { //部分選中狀態 parent->setCheckState(0,Qt::PartiallyChecked); } else if(selectedCount==childCount) { parent->setCheckState(0,Qt::Checked); }
最終實現的就是第一張圖的效果。
到此這篇關於Qt中樹形控件Tree Widget的一些使用方法的文章就介紹到這瞭,更多相關Qt樹形控件Tree Widget使用內容請搜索WalkonNet以前的文章或繼續瀏覽下面的相關文章希望大傢以後多多支持WalkonNet!
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