UTF8 & GTK
lazarus / 5-Lazarus Extra Components

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Onjahyr-BR · 2006-10-07 05:28

Accented characters are a problem.

I intend to write in a TEdit and to send for a TLabel and a TPanel.

For a TLabel it is horrible  :lol:

already for a TPanel, no problem does not occur.

I could place TPanel instead of TLabel, however, I do not have the
property wordwrap, somebody could create a descending component of
TPanel with this property?

 :wink:

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Onjahyr-BR · 2006-10-08 22:05

how create component? help me, please.

They write unit here in forum now

Tks.

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felipemdc · 2006-10-09 00:20

To create a new component, just create a new unit, and put a class on
that unit, like this:

type
  TMyComponent = class(TCustomControl)
  public
    constructor Create(Parent: TComponent);
  end;

First you need to understand that we have two kinds of visual
controls:

* TCustomControl descendents

These controls do not have a Handle. They are painted directly on the
Canvas of the form, and thus automatically work for all platform that
Lazarus support. You can learn how to create a TCustomControl
descendent here:

http://wiki.lazarus.freepascal.org/Developing_with_Graphics#Create_a_c
ustom_control_which_draws_itself

Note that this page has portuguese translation

You can do anything that TCanvas allows + use any painting function
from LCLIntf and your app will work on all platforms. These, however,
may not be enougth for what you want, or there may be a much easier
way to do what you want by accessing the underlying widgetset
directly.

* Windowed controls, or controls with a Handle

A Handle is a connection to the underlying widgetset. If you create a
control with a handle, you will need to implement part of it
differently on each widgetset.

This, however will give you access to the most powerful features of
each OS.

A example of TCustomControl descendent is TLabel.

Examples of windowed controls are: TStaticText and TPanel.

Why accents work better on TPanel? Because it is a windowed control,
and the text is sent directly to Gtk. I think that using TStaticText
will solve your problem.

If not, you can create your own Windowed control.