procedure TForm1.TreeView1Click(Sender: TObject);
begin
if TreeView1.Selected <> nil then
begin
if TreeView1.Selected.Text = '停止' then
begin
TreeView1.Items.Item[0].Text:='开始';
TreeView1.Items[0].ImageIndex:=1;
TreeView1.items[0].SelectedIndex:=1;
end;
if TreeView1.Selected.Text = '开始' then
begin
TreeView1.Items.Item[0].Text:='停止';
TreeView1.Items[0].ImageIndex:=0;
TreeView1.items[0].SelectedIndex:=0;
end;
end;
end;为什么这样什么反应也没有?如果不要第二个if语句第一个if的效果就可以出现请问,我想实现代码里要求的效果该如何修改 ?谢谢
begin
if TreeView1.Selected <> nil then
begin
if TreeView1.Selected.Text = '停止' then
begin
TreeView1.Items.Item[0].Text:='开始';
TreeView1.Items[0].ImageIndex:=1;
TreeView1.items[0].SelectedIndex:=1;
end
else //**if TreeView1.Selected.Text = '开始' then//你的程序相当与双置开关,第二个判断不要,直接else
begin
TreeView1.Items.Item[0].Text:='停止';
TreeView1.Items[0].ImageIndex:=0;
TreeView1.items[0].SelectedIndex:=0;
end;
end;
end;
procedure TForm1.TreeView1Click(Sender: TObject);
begin
if TreeView1.Selected <> nil then
begin
if TreeView1.Selected.Text = '停止' then
begin
TreeView1.Items.Item[0].Text:='开始';//
TreeView1.Items[0].ImageIndex:=1;
TreeView1.items[0].SelectedIndex:=1;
Exit;//跳出当前过程,不然下面“TreeView1.Selected.Text = '开始'”可能又为真
end;
if TreeView1.Selected.Text = '开始' then
begin
TreeView1.Items.Item[0].Text:='停止';
TreeView1.Items[0].ImageIndex:=0;
TreeView1.items[0].SelectedIndex:=0;
end;
end;
end;