Форум: "Основная";
Текущий архив: 2004.05.30;
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TreeView   Найти похожие ветки 

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Sergo ©   (2004-05-17 10:26) [0]

Поставил CheckBox"s на ветки в TreeView при помощи
SetWindowLong(TreeView1.handle,GWL_STYLE,GetWindowLong(TreeView1.handle,GWL_STYLE) or TVS_CHECKBOXES);
И возник вопрос, как сделать обработчик на эти CheckBox"s?

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← →
Mim1 ©   (2004-05-17 11:00) [1]

Я в свое время оформил маленький компонент


unit TreeViewFQ;

interface

uses
 SysUtils, Classes, Controls, ComCtrls, Windows, Messages, CommCtrl;

type
 TTVAutoCheck = (acMarkUp,acMarkDown,acUnMarkUp,acUnmarkDown);
 TTVAutoCheckSet = set of TTVAutoCheck;
 TTreeViewCheckedChangeEvent = procedure (Sender: TObject; Node:TTreeNode; NewState:Boolean) of object;
 TTreeViewFQ = class(TTreeView)
 private
   FNodeCheckedChanged : TTreeViewCheckedChangeEvent;
   FAutoCheck : TTVAutoCheckSet;
   Procedure DoNodeCheckedChanged(Node:TTreeNode; NewState:Boolean);
   Procedure ReCheck(Node:TTreeNode);
 protected
   Procedure WMMD(var Message: TWMLButtonDown); message WM_LBUTTONDOWN;
   procedure WMKeyDown(var Message: TWMKeyDown); message WM_KEYDOWN;
   procedure CreateParams(var Params: TCreateParams); override;
 public
   Function GetChecked(node : TTreeNode):boolean;
   Procedure SetChecked(Node:TTreeNode; value : Boolean);
   constructor Create(AOwner: TComponent); override;
 published
   property OnNodeCheckedChanged : TTreeViewCheckedChangeEvent read FNodeCheckedChanged write FNodeCheckedChanged;
   property AutoCheck : TTVAutoCheckSet read FAutoCheck write FAutoCheck;
 end;

procedure Register;

implementation

const
 IIL_UNCHECKED = 1;
 IIL_CHECKED   = 2;

procedure Register;
begin
 RegisterComponents("Standard", [TTreeViewFQ]);
end;

{ TTreeViewFQ }

constructor TTreeViewFQ.Create(AOwner: TComponent);
begin
 inherited;
 FAutoCheck := [];
end;

procedure TTreeViewFQ.CreateParams(var Params: TCreateParams);
begin
 inherited;
 with Params do Style := Style or TVS_CHECKBOXES;
end;

procedure TTreeViewFQ.DoNodeCheckedChanged(Node: TTreeNode;
 NewState: Boolean);
begin
 ReCheck(Node);  
 if Assigned(FNodeCheckedChanged) then
   FNodeCheckedChanged(Self,Node,NewState);
end;

function TTreeViewFQ.GetChecked(node : TTreeNode): boolean;
var
 Item:TTvItem;
begin
 Item.hItem := Node.ItemId;
 Item.Mask := TVIF_STATE;
 Item.StateMask := TVIS_STATEIMAGEMASK;
 if not TreeView_GetItem(self.Handle,Item) then Abort;
 Result := ((integer(Item.State) and INDEXTOSTATEIMAGEMASK(IIL_CHECKED)) =
   INDEXTOSTATEIMAGEMASK(IIL_CHECKED));
end;

procedure TTreeViewFQ.ReCheck(Node: TTreeNode);
var curstate, b : Boolean;
   i:integer;
begin
 curstate := GetChecked(Node);

 if (acMarkUp in FAutoCheck) and curstate then
   if Node.Parent <> nil then
     SetChecked(Node.Parent,true);

 if (acMarkDown in FAutoCheck) and curstate then
   for i:= 0 to Node.Count -1 do
     SetChecked(node[i],true);

 if (acUnMarkUp in FAutoCheck) and not curstate then
   if Node.Parent <> nil then
     begin
       b := true;
       for i:= 0 to Node.Parent.Count -1 do
         if GetChecked(Node.Parent[i]) then
           begin
             b := false;
             break;
           end;
       if b then SetChecked(Node.Parent,false);
     end;

 if (acUnMarkDown in FAutoCheck) and not curstate then
   for i:= 0 to Node.Count -1 do
     SetChecked(node[i],false);
end;

procedure TTreeViewFQ.SetChecked(Node: TTreeNode; value: Boolean);
var
 Item:TTvItem;
begin
 if value = GetChecked(Node) then exit;
 
 Item.hItem := Node.ItemId;
 Item.Mask := TVIF_STATE;
 Item.StateMask := TVIS_STATEIMAGEMASK;
 if not TreeView_GetItem(self.Handle, Item) then Exit;
 if value then
   Item.State := INDEXTOSTATEIMAGEMASK(IIL_CHECKED)
 else
   Item.State := INDEXTOSTATEIMAGEMASK(IIL_UNCHECKED);
 TreeView_SetItem(self.Handle,Item);

 ReCheck(Node);
end;

procedure TTreeViewFQ.WMKeyDown(var Message: TWMKeyDown);
var tn1,tn2:TTreeNode;
   b:Boolean;
begin
 if Message.CharCode <> VK_SPACE then
   begin
     inherited;
     exit;
   end;
 b:=false;
 tn1 := Selected;
 if tn1 <> nil then
   b := GetChecked(tn1);
 inherited;
 tn2 := Selected;
 if (tn1 <> nil) and (tn2 <> nil) and (tn1 = tn2) and (b <> GetChecked(tn2)) then
   DoNodeCheckedChanged(tn2,not b);
end;

procedure TTreeViewFQ.WMMD(var Message: TWMLButtonDown);
var tn1,tn2:TTreeNode;
   b:Boolean;
begin
 b:=false;
 tn1 := GetNodeAt(Message.XPos,Message.YPos);
 if tn1 <> nil then
   b := GetChecked(tn1);
 inherited;
 tn2 := GetNodeAt(Message.XPos,Message.YPos);
 if (tn1 <> nil) and (tn2 <> nil) and (tn1 = tn2) and (b <> GetChecked(tn2)) then
   DoNodeCheckedChanged(tn2,not b);
end;

end.


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← →
Sergo ©   (2004-05-17 13:05) [2]

Спасибо

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Форум: "Основная";
Текущий архив: 2004.05.30;
Скачать: [xml.tar.bz2];

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