TreeView设置节点不同高度一种实现
效果如下
为了实现不同节点有不同的高度，本想重新做个TreeView，但是时间来不急了，只好想了个折中的办法
const int nGroupItemHeight = 22;
const int nNormalItemHeight = 30;
const int nSelectedItemHeight = 50;
//---------------------------------------------------------------------------
__fastcall TForm1::TForm1(TComponent* Owner)
: TForm(Owner)
{
tvInfo->DoubleBuffered = true;
int cyItemHeight = 1;
SendMessage(tvInfo->Handle,TVM_SETITEMHEIGHT,(WPARAM)(SHORT)cyItemHeight,0);//修改节点高度至1像素
}
//---------------------------------------------------------------------------
void __fastcall TForm1::tvInfoCustomDrawItem(TCustomTreeView *Sender, TTreeNode *Node,
TCustomDrawState State, bool &DefaultDraw)
{
//以下参考妖哥的ListBox自绘
DefaultDraw = false;
TRect Rect = Node->DisplayRect(false);
// 填充的背景颜色
Sender->Canvas->Brush->Color = clWhite;
// 文字颜色
Sender->Canvas->Font->Color = clBlack;
// 填充背景
Sender->Canvas->FillRect (Rect) ;
// 圆角矩形的背景颜色
Sender->Canvas->Brush->Color = TColor(0x00FFF7F7);
// 圆角矩形的边框颜色
Sender->Canvas->Pen->Color = TColor(0x00131315);
// 画出圆角矩形
Sender->Canvas->RoundRect(Rect.Left + 3, Rect.Top + 3,
Rect.Right - 2, Rect.Bottom - 2, 8, 8);
// 以不同的宽度和高度再画一次，实现立体效果
Sender->Canvas->RoundRect(Rect.Left + 3, Rect.Top + 3,
Rect.Right - 3, Rect.Bottom - 3, 5, 5);
// 如果是当前选中项
if(State.Contains(odSelected))
{
// 选中项的背景颜色
Sender->Canvas->Brush->Color = TColor(0x00FFB2B5);
// 以不同的背景色画出选中项的圆角矩形
Sender->Canvas->RoundRect(Rect.Left + 3, Rect.Top + 3,
Rect.Right - 3, Rect.Bottom - 3, 5, 5);
// 选中项的文字颜色
Sender->Canvas->Font->Color = clBlue;
// 如果当前项拥有焦点
if(State.Contains(odFocused))
// 重画焦点虚框，实际上就是擦除了原先的焦点虚框
// 我看到CnPack的设置中好象没有去除那个框. ccrun注
::DrawFocusRect(Sender->Canvas->Handle, &Rect);
}
// 画出图标
ImageList1->Draw(Sender->Canvas, Rect.Left + 7 + (nTimer%2),
Rect.top + (Rect.Height() - ImageList1->Height)/2, 1, true);
// Item的第一行文字
Sender->Canvas->TextOutA(Rect.Left + Node->Level*32 + 20, Rect.Top + 4,
Node->Text);
}
//---------------------------------------------------------------------------
void __fastcall TForm1::btnInitClick(TObject *Sender)
{
tvInfo->Items->Clear();
tvInfo->Items->BeginUpdate();
for(int nGroupIndex=0;nGroupIndex<100;nGroupIndex++)
{
TTreeNode* nGroupNode = tvInfo->Items->Add(NULL,"Group"+IntToStr(nGroupIndex));
TVITEMEX itemEx;
TTreeNode* nCurrNode = nGroupNode;
itemEx.hItem = nCurrNode->ItemId;
itemEx.mask = TVIF_INTEGRAL;
itemEx.iIntegral = nGroupItemHeight;
SendMessage(tvInfo->Handle,TVM_SETITEM, 0, LPARAM(&itemEx));//调整高度
for(int nItem=0;nItem<10;nItem++)
{
TTreeNode* nNode = tvInfo->Items->AddChild(nGroupNode,"Item"+IntToStr(nItem));
TVITEMEX itemEx;
TTreeNode* nCurrNode = nNode;
itemEx.hItem = nCurrNode->ItemId;
itemEx.mask = TVIF_INTEGRAL;
itemEx.iIntegral = nNormalItemHeight;
SendMessage(tvInfo->Handle,TVM_SETITEM, 0, LPARAM(&itemEx));//调整高度
}
}
tvInfo->Items->EndUpdate();
}
//---------------------------------------------------------------------------
void __fastcall TForm1::tvInfoChanging(TObject *Sender, TTreeNode *Node, bool &AllowChange)
{
//
tvInfo->Items->BeginUpdate();
TTreeNode* nCurrNode = NULL;
TVITEMEX itemEx;
if( tvInfo->Selected != NULL )
{
nCurrNode = tvInfo->Selected;
if( nCurrNode->Level != 0 )
{
itemEx.hItem = nCurrNode->ItemId;
itemEx.mask = TVIF_INTEGRAL;
itemEx.iIntegral = nNormalItemHeight;
SendMessage(tvInfo->Handle,TVM_SETITEM, 0, LPARAM(&itemEx));//还原选中节点高度
}
}
nCurrNode = Node;
if( nCurrNode->Level != 0 )
{
itemEx.hItem = nCurrNode->ItemId;
itemEx.mask = TVIF_INTEGRAL;
itemEx.iIntegral = nSelectedItemHeight;
SendMessage(tvInfo->Handle,TVM_SETITEM, 0, LPARAM(&itemEx));//更改新的选中节点高度
}
tvInfo->Items->EndUpdate();
}
//---------------------------------------------------------------------------
void __fastcall TForm1::tvInfoMouseDown(TObject *Sender, TMouseButton Button, TShiftState Shift,
int X, int Y)
{
//自绘模式下行选
TTreeNode *ClickNode;
ClickNode = tvInfo->GetNodeAt(X, Y);
if(ClickNode != NULL)
ClickNode->Selected = true;
}
//---------------------------------------------------------------------------
