Panels and alignment

[Dave Craggs 7]

If you have a panel with items inside all aligned left. How do you maintain the order when you change visibility? The items start in the correct order, but it you hide one and then later make it visible, it can end up in the wrong position. 

 

 

[Dave Craggs 7]

Hmm - could I do something with the Left property maybe?

 

[Dave Craggs 7]

OK got it.

 

Hide all the controls and set align to alNone.

 

then go though in the order that you want setting them to visible and align to alLeft.

[aehimself 388]

You can also rearrange visible controls by setting the .Left property to the previous control's Left + 1. That way, it will be placed immediately after it.

You might also want to wrap everything in Container.DiableAlign and .EnableAlign so you get the results you want to see.

[Uwe Raabe 1891]

Another answer can be found on StackOverflow (although for alTop) Delphi: How to programmatically adjust visual ordering of components with align = alTop

Edited March 10, 2023 by Uwe Raabe

[programmerdelphi2k 235]

maybe putting all "panel (with your alignment)" in a "PANEL" then, can help you not? if in FMX, use a TLayout

 

procedure TForm1.Btn_Hide_Show_PanelsClick(Sender: TObject);
begin
 // who will be the first... or last = visible?
  for var i: integer := 0 to (Form1.ComponentCount - 1) do
    if Form1.Components[i] is TPanel then
      TPanel(Form1.Components[i]).Visible := not TPanel(Form1.Components[i]).Visible;
end;

procedure TForm1.Btn_Show_Hide_PanelONEClick(Sender: TObject);
begin
 // nothing should be change here! stay where was defined!
  Panel1.Visible := not Panel1.Visible;
end;

all aligned on "Left": 2,3,4,5,6

     

Edited March 10, 2023 by programmerdelphi2k

[Bill Meyer 334]

Is there a reason you can't use a FlowPanel?

[programmerdelphi2k 235]

The problem with the "FlowPanel" is precisely the "flow of controls inside it"... Try placing the 5 panels above (left aligned) and resizing the "FlowPanel" to different sizes, including changing the "FlowStyle" to whatever others...

 

First, you may not be able to keep all the sub-panels left-aligned (like the sample above), as the "FlowPanel" will have its own alignment rule! So the "Align" property of the sub-panels will have no effect!

 

 

[Bill Meyer 334]

On 3/12/2023 at 4:48 PM, programmerdelphi2k said:

The problem with the "FlowPanel" is precisely the "flow of controls inside it"... Try placing the 5 panels above (left aligned) and resizing the "FlowPanel" to different sizes, including changing the "FlowStyle" to whatever others...

 

First, you may not be able to keep all the sub-panels left-aligned (like the sample above), as the "FlowPanel" will have its own alignment rule! So the "Align" property of the sub-panels will have no effect!

 

 

With the Flow Panel, you use the ControlIndex property to set the order. And the FlowStyle to manage orientation.  Your original question was about what happens to order when you hide and restore elements. The Flow Panel can resolve that. Alternately, you can achieve the results by setting the Tag property of each control on the panel and managing the order in code. I have done it both ways. The Flow Panel is easier, by far.

[Pat Foley 50]

Try dropping a ControlwithmarginsSet.AlignWithMargins :.= True and see what happens!

 

// the margin property isn't just for making porting to Lazarus a chore.  

[programmerdelphi2k 235]

really, I dont see "ControlIndex" helping in this task...  try expand/colapse the "FlowPanel" as my sample above and see the real resulted... 😩 no no no!

now, if you need just "hide/show" then, any other "container with many panels" do it, not? (be Panel, FlowPanel, Rectangles, etc...

[Bill Meyer 334]

13 minutes ago, programmerdelphi2k said:

really, I dont see "ControlIndex" helping in this task...  try expand/colapse the "FlowPanel" as my sample above and see the real resulted... 😩 no no no!

now, if you need just "hide/show" then, any other "container with many panels" do it, not? (be Panel, FlowPanel, Rectangles, etc...

And if you are correct, then the ultimate solution lies in coding.

[programmerdelphi2k 235]

I think that my first sample it's good and simple, just using basic idea with "obj containers". 

Using "FlowPanel", it's not so wrong... but I think that "it" it's not for this tasks... but if OP want more coding then both would can do it! (not necessary so easy using FlowPanel)