创建一个带有CheckBox的TreeView

ゝ一纸荒年。 2022-09-20 05:58 101阅读 0赞

void \_\_fastcall TForm1::FormCreate(TObject \*Sender)  
\{  
SetWindowLong(TreeView1->Handle,GWL\_STYLE,  
GetWindowLong(TreeView1->Handle,GWL\_STYLE) | TVS\_CHECKBOXES);  
  
\}  
//判断一个节点是否处于Checked状态  
bool GetNodeChecked(TTreeNode \*ANode)  
\{  
TVITEM tvItem;  
tvItem.mask = TVIF\_HANDLE | TVIF\_STATE;  
tvItem.hItem = ANode->ItemId;  
tvItem.stateMask = TVIS\_STATEIMAGEMASK;  
TreeView\_GetItem(ANode->TreeView->Handle, %26amp;tvItem);  
return ((BOOL)(tvItem.state >> 12) -1);  
\}  
//设置一个节点为Checked状态或者Unchecked状态，由参数IsSetToChecked来确定  
void SetNodeChecked(TTreeNode \*ANode,bool IsSetToChecked)  
\{  
TVITEM tvItem;  
tvItem.mask = TVIF\_HANDLE | TVIF\_STATE;  
tvItem.hItem = ANode->ItemId;  
tvItem.stateMask = TVIS\_STATEIMAGEMASK;  
tvItem.state = INDEXTOSTATEIMAGEMASK(IsSetToChecked?2:1);  
TreeView\_SetItem(ANode->TreeView->Handle, %26amp;tvItem);  
\}  
void SetChildChecked(TTreeNode \*ANode,bool yn)  
\{ // 把它的子孙都置成一样  
int count=ANode->Count;  
SetNodeChecked(ANode,yn);  
if (count!=0)  
for (int i=0;i SetChildChecked(ANode->Item,yn);  
\}  
// TTreeNode \*ClickNode; // 保存点中的节点  
// bool NodeChecked; // 保存点中的节点checked  
void \_\_fastcall TForm1::TreeView1MouseMove(TObject \*Sender,  
TShiftState Shift, int X, int Y)  
\{  
ClickNode=TreeView1->GetNodeAt(X,Y);  
if (ClickNode!=NULL) // 保存原节点的Checked值  
NodeChecked=GetNodeChecked(ClickNode);  
\}  
void \_\_fastcall TForm1::TreeView1MouseDown(TObject \*Sender,  
TMouseButton Button, TShiftState Shift, int X, int Y)  
\{  
if (ClickNode!=NULL)  
if (GetNodeChecked(ClickNode)!=NodeChecked)  
\{ // 把它的子孙都置成一样  
NodeChecked=!NodeChecked; // 更新它  
SetChildChecked(ClickNode,NodeChecked);  
\}  
\}