使用 Node.StateIndex 放图片
然后判断放的是哪个图片来决定是否被选中。看看我的这个小东西,我可以把treeview的这部分源码给你,要的话留email
http://www.csdn.net/cnshare/soft/12/12436.shtm
然后判断放的是哪个图片来决定是否被选中。看看我的这个小东西,我可以把treeview的这部分源码给你,要的话留email
http://www.csdn.net/cnshare/soft/12/12436.shtm
调试欢乐多
在 TreeView的onclick中加入:
if Selected.Level>0 then
begin
if Selected.ImageIndex = 0 then
begin
Selected.ImageIndex := 1;
ImgIndex := 1;
end
else
begin
Selected.ImageIndex := 0;
ImgIndex := 0;
end;
end;
在确认的时候判断
TreeNode.ImageIndex的值来判断是否选中了。
全选中、部分选中、不选状态(直接拍下CheckBox三种状态的图片在加工一下就可以了),然后在点击事件中根据具体情况设置TTreeNodes的ImageIndex就OK了。
重载TreeView的CreateParams:
type
TCheckBoxTreeView = class(TTreeView)
protected
procedure CreateParams(var Params: TCreateParams); override;
end;procedure TCheckBoxTreeView.CreateParams(var Params: TCreateParams);
begin
inherited;
Params.Style:=Params.Style or TVS_CHECKBOXES;
{ TVS_CHECKBOXES declared in CommCtrl }
end;如果要Check这个CheckBox,可以用下面的代码:
function IsNodeChecked(Node :TTreeNode) :Boolean;
const
TVIS_CHECKED = $2000;
var
TvItem :TTVItem;
begin
TvItem.Mask := TVIF_STATE;
TvItem.hItem := Node.ItemId;
TreeView_GetItem(Node.TreeView.Handle, TvItem);
Result := (TvItem.State and TVIS_CHECKED) = TVIS_CHECKED;
end;procedure SetNodeChecked(Node :TTreeNode; Checked :Boolean);
const
TVIS_CHECKED = $2000;
var
TvItem :TTVItem;
begin
FillChar(TvItem, SizeOf(TvItem), 0);
with TvItem do begin
hItem := Node.ItemId;
Mask := TVIF_STATE;
StateMask := TVIS_STATEIMAGEMASK;
if Checked then
TvItem.State :=TVIS_CHECKED
else
TvItem.State :=TVIS_CHECKED shr 1;
TreeView_SetItem(Node.TreeView.Handle, TvItem);
end;
end;
可以做成事件和封装成一个类:
private OldState :Boolean;procedure Change(Node: TTreeNode); override;
begin
inherited Change(Node);
OldState := IsNodeChecked(Node);
end;procedure Click; override;
var
NewState :Boolean;
begin
inherited Click;
NewState := IsNodeChecked(Self.Selected);
if NewState = OldState then Exit;
if (NewState) and Assigned(OnNodeChecked) then OnNodeChecked()
else if (not NewState) and Assigned(OnNodeUnChecked) then
OnNodeUnChecked()// OnNodeChecked & OnNodeUnchecked will be events that you declare
end;
全选中、部分选中、不选状态(直接拍下CheckBox三种状态的图片在加工一下就可以了),然后在点击事件中根据具体情况设置TTreeNodes的ImageIndex就OK了。
重载TreeView的CreateParams:
type
TCheckBoxTreeView = class(TTreeView)
protected
procedure CreateParams(var Params: TCreateParams); override;
end;procedure TCheckBoxTreeView.CreateParams(var Params: TCreateParams);
begin
inherited;
Params.Style:=Params.Style or TVS_CHECKBOXES;
{ TVS_CHECKBOXES declared in CommCtrl }
end;如果要Check这个CheckBox,可以用下面的代码:
function IsNodeChecked(Node :TTreeNode) :Boolean;
const
TVIS_CHECKED = $2000;
var
TvItem :TTVItem;
begin
TvItem.Mask := TVIF_STATE;
TvItem.hItem := Node.ItemId;
TreeView_GetItem(Node.TreeView.Handle, TvItem);
Result := (TvItem.State and TVIS_CHECKED) = TVIS_CHECKED;
end;procedure SetNodeChecked(Node :TTreeNode; Checked :Boolean);
const
TVIS_CHECKED = $2000;
var
TvItem :TTVItem;
begin
FillChar(TvItem, SizeOf(TvItem), 0);
with TvItem do begin
hItem := Node.ItemId;
Mask := TVIF_STATE;
StateMask := TVIS_STATEIMAGEMASK;
if Checked then
TvItem.State :=TVIS_CHECKED
else
TvItem.State :=TVIS_CHECKED shr 1;
TreeView_SetItem(Node.TreeView.Handle, TvItem);
end;
end;
可以做成事件和封装成一个类:
private OldState :Boolean;procedure Change(Node: TTreeNode); override;
begin
inherited Change(Node);
OldState := IsNodeChecked(Node);
end;procedure Click; override;
var
NewState :Boolean;
begin
inherited Click;
NewState := IsNodeChecked(Self.Selected);
if NewState = OldState then Exit;
if (NewState) and Assigned(OnNodeChecked) then OnNodeChecked()
else if (not NewState) and Assigned(OnNodeUnChecked) then
OnNodeUnChecked()// OnNodeChecked & OnNodeUnchecked will be events that you declare
end;
全选中、部分选中、不选状态(直接拍下CheckBox三种状态的图片在加工一下就可以了),然后在点击事件中根据具体情况设置TTreeNodes的ImageIndex就OK了。
重载TreeView的CreateParams:
type
TCheckBoxTreeView = class(TTreeView)
protected
procedure CreateParams(var Params: TCreateParams); override;
end;procedure TCheckBoxTreeView.CreateParams(var Params: TCreateParams);
begin
inherited;
Params.Style:=Params.Style or TVS_CHECKBOXES;
{ TVS_CHECKBOXES declared in CommCtrl }
end;如果要Check这个CheckBox,可以用下面的代码:
function IsNodeChecked(Node :TTreeNode) :Boolean;
const
TVIS_CHECKED = $2000;
var
TvItem :TTVItem;
begin
TvItem.Mask := TVIF_STATE;
TvItem.hItem := Node.ItemId;
TreeView_GetItem(Node.TreeView.Handle, TvItem);
Result := (TvItem.State and TVIS_CHECKED) = TVIS_CHECKED;
end;procedure SetNodeChecked(Node :TTreeNode; Checked :Boolean);
const
TVIS_CHECKED = $2000;
var
TvItem :TTVItem;
begin
FillChar(TvItem, SizeOf(TvItem), 0);
with TvItem do begin
hItem := Node.ItemId;
Mask := TVIF_STATE;
StateMask := TVIS_STATEIMAGEMASK;
if Checked then
TvItem.State :=TVIS_CHECKED
else
TvItem.State :=TVIS_CHECKED shr 1;
TreeView_SetItem(Node.TreeView.Handle, TvItem);
end;
end;
可以做成事件和封装成一个类:
private OldState :Boolean;procedure Change(Node: TTreeNode); override;
begin
inherited Change(Node);
OldState := IsNodeChecked(Node);
end;procedure Click; override;
var
NewState :Boolean;
begin
inherited Click;
NewState := IsNodeChecked(Self.Selected);
if NewState = OldState then Exit;
if (NewState) and Assigned(OnNodeChecked) then OnNodeChecked()
else if (not NewState) and Assigned(OnNodeUnChecked) then
OnNodeUnChecked()// OnNodeChecked & OnNodeUnchecked will be events that you declare
end;
还有没别的方法!
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先谢过啦!