[Solved] Tsplitter Example with 2 panels and MinSize
lazarus / 10-Designer

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Mujie · 2010-06-27 18:06

Hi,
Does anybody here have an example of how to use TSplitter with 2
panels ? I have been successful to resize a left panel with
TSplitter1.MinSize, but failed for a right panel. How to prevent
resize the right panel's with a TSplitter and with a specify width
(MinSize) ? I don't want use a TPairSplitter.

Thanks for your kindness sir..

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theo · 2010-06-27 21:50

Each panel has its own "constraints" property.

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Mujie · 2010-06-28 04:09

Please attach some example project or paste some code if you don't
mind, I'm still confused   .Thank you....

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theo · 2010-06-28 06:08

Constraints.MinSize is a property of each TControl. See Object
Inspector.
If this is not what you want, then maybe you should rephrase your
question.

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Mujie · 2010-06-28 06:44

Sorry, maybe I had a little trouble for expressing my question.

I had to change it so that the second panel's width is limited, but
although I had to change anyway with "Constraints.MinSize", the second
panel's right border was always moving to the right until exit from
main form.

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JuhaManninen · 2010-06-28 08:35

Use Align and Anchors instead of Constraints to stop the panel from
moving. A good and easy way is to set left panel's Align=alLeft,
splitter's Align=alLeft and right panel's Align=alClient.
There is also anchor editor for more advanced layouts.

Juha

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Mujie · 2010-06-28 14:06

Cool... its solved now, many thanks for Juha and Theo  .

Now, below are the steps for anyone who may have difficulties in the
use of these components :

1. Create a new project.
2. Drag a new two panels to the main form.
3. Set each Contraints MinSize panel's properties from Object
Inspector, eg "50".
4. Drag a new TSplitter from Additional pallete component (right tab
from Standar component).
5. Set Panel1 align properties to "alLeft", Panel2 align to
"alClient", and Splitter1 to "alLeft".
6. Double click Form1 "Oncreate" events (still from Object Inspector),
and fill the space with this code (optional) :

Code: [Select]  Splitter1.Left := Panel1.Width;
  Panel2.Left := Splitter1.Left + Splitter1.Width;

7. Finish, run your project.

I love Lazarus and this forum

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JuhaManninen · 2010-06-28 21:20

Quote from: Mujie on June 28, 2010, 04:06:46 pm5. Set Panel1 align
properties to "alLeft", Panel2 align to "alClient", and Splitter1 to
"alLeft".
6. Double click Form1 "Oncreate" events (still from Object Inspector),
and fill the space with this code (optional) :

Code: [Select]  Splitter1.Left := Panel1.Width;
  Panel2.Left := Splitter1.Left + Splitter1.Width;

It is much simpler than what you explained.
If you set the Align properties in the order I gave (left panel,
splitter, right panel), starting from the initial Align=alNone, you
don't need the step 6.
All the layout changes happen already at design time so it is really
WYSIWYG.

Please play also with the anchor editor. Delphi doesn't have such
thing and it took me some time to even notice it exists.

Juha

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Kaller · 2012-08-19 06:29

The standard recipe setting the align of the panels has a fault, the
alclient aligned panel will not fully "close". It loooks as if an
autosnap was anticipated but not implemented, the spliiter comes up
short and wont fully minimise that panel.  So I carefully set up a
splitter using just the anchor editor (its kinda cool once you figure
it out) and I got it working. But also I had to set the MinSize of the
splitter to 1. Go figure.

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eny · 2012-08-19 08:05

Quote from: Kaller on August 19, 2012, 08:29:28 amThe standard recipe
setting the align of the panels has a fault, And you are also using
version 0.9.29 which was the stable Lazarus version in 2010, the year
of this more than 2 year old topic???

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Kaller · 2012-09-06 05:27

I always install the latest and greatest. The splitter wont close to
the left either when you reverse the alignments.