Difference between revisions of "The LCL in various platforms"
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The GTK2 automatically adds to all edit controls like TEdit and TComboBox unicode and accessibility items. | The GTK2 automatically adds to all edit controls like TEdit and TComboBox unicode and accessibility items. | ||
+ | |||
+ | == Command line parameters == | ||
+ | |||
+ | Some widgetsets parse the command line parameters and react to some parameters. | ||
+ | |||
+ | '''GTK''' | ||
+ | |||
+ | * --gtk-module | ||
+ | * --g-fatal-warnings | ||
+ | * --gtk-debug | ||
+ | * --gtk-no-debug | ||
+ | * --gdk-debug | ||
+ | * --gdk-no-debug | ||
+ | * --display | ||
+ | * --sync | ||
+ | * --no-xshm | ||
+ | * --name | ||
+ | * --class |
Revision as of 23:37, 30 June 2008
Introduction
Many LCL properties, methods and other functionality represent a concept, which is then mapped to a specific native behavior in each platform. This sections aims at clarifying LCL behavior which changes across platforms by clarifying what is to be expected in each platform so that more reliable software can be built.
TForm.BorderStyle
The BorderStyle of a Form represents a kind of form, and different platforms have different standards about how should the border of each kind of form be, and the LCL respects that. For example, message dialogs are usually not resizable under Windows, but resizable under X11-based Unixes. By using bsDialog it is possible to create a form which will have the adequate dialog appearance in every platform. Bellow is a full list of expected behaviors:
Windows
BorderStyle | Has Border? | Resizable? | Decoration |
---|---|---|---|
bsNone | No | No | None |
bsDialog | Yes | No | Only X (Close) |
bsSingle | Yes | No | All |
bsSizable | Yes | Yes | All |
bsSizeToolWin | Yes | Yes | Only X and small title |
bsToolWin | Yes | No | Only X and small title |
Windows CE
For Windows CE see here: Windows_CE_Development_Notes#Positioning_and_size_of_Dialogs_and_Forms
Gtk
Under Gtk on X11 the best one can do is ask the window manager to set a certain style, and it may ignore our request, so nothing, except sizable border vs. no border at all is guaranteed. i.e. only bsSizable and bsNone have a guaranteed behavior and the other ones will be either somewhere in between or equal to bsSizable.
Gtk 1 | Gtk 2 | |||||
---|---|---|---|---|---|---|
BorderStyle | Has Border? | Resizable? | Decoration | Has Border? | Resizable? | Decoration |
bsNone | No | No | None | No | No | None |
bsDialog | Yes | Yes* | All* | Yes | Yes* | All* |
bsSingle | Yes | No (WM) | All | Yes | No (WM) | All |
bsSizable | Yes | Yes | All | Yes | Yes | All |
bsSizeToolWin | Yes | Yes | All* | Yes | Yes | All* |
bsToolWin | Yes | No (WM) | All* | Yes | No (WM) | All* |
Values with * differ from the Windows Implementation.
Values with (WM) indicate that the feature is Window Manager specific.
Associated bug track items: [1]
Carbon
Shortcut Keys
Some Key sequences cannot be used by the Application in some platforms because the Operating System or Windows Manager is already using them. Bellow is a list for each platform.
Mac OS X
You should refer to Apple Human Interface Guidelines for system reserved shortcuts: http://developer.apple.com/DOCUMENTATION/UserExperience/Conceptual/AppleHIGuidelines/XHIGKeyboardShortcuts/chapter_950_section_1.html
Key Sequence | Alternative | Description |
---|---|---|
F12 / Shift+F12 | ? | F12 Brings the Dashboard |
F11 / Shift+F11 | ? | F11 Shows the Desktop |
Popup Menus
Normally the popup menus are the items in the TPopupMenu assigned to the PopupMenu property.
GTK
The GTK automatically adds to the TNoteBook and TPageControl headers for each page a menu item to quick jump to the page.
GTK2
The GTK2 automatically adds to all edit controls like TEdit and TComboBox unicode and accessibility items.
Command line parameters
Some widgetsets parse the command line parameters and react to some parameters.
GTK
- --gtk-module
- --g-fatal-warnings
- --gtk-debug
- --gtk-no-debug
- --gdk-debug
- --gdk-no-debug
- --display
- --sync
- --no-xshm
- --name
- --class