Scol » Lib2D GTK

h1. Widget callbacks

A signal will be emitted when an event occurs on a widget.

To run any actions when a signal is emitted, you should define a _callback_, a function will run these actions.

Here, you can define all callbacks with an one function : *_gtkWidgetCB*

Its prototype is : *fun [ObjGtkWidget u1 u0 I I] ObjGtkWidget*

# *ObjGtkWidget* : Scol object : the widget

# *u1* : the prototype of the callback (see below)

# *u0* : the user parameter, at your convenience

# *I* : the flag of the callback = which signal is affected ? (see below)

# *I* : the mask : propagate or not the signal to the container ? Two values are availables

* SCOL_GTK_SIGNAL_MASK_PROPAGATE

* SCOL_GTK_SIGNAL_MASK_STOP

+Warning+ : the prototype of the callback is different for each flag !

Flag currently availables :

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h2. SCOL_GTK_WIDGET_BUTTONPRESSED

a mouse button has been pressed on a widget.

Prototype : *fun [ObjGtkWidget u0 I I I [I I]] u2*

table

|1. *widget*|ObjGtkWidget|a widget| |

|2. *userparam*|u0|a user parameter, at your convenience| |

|3. *signal*|I|the type of the signal|SCOL_GTK_EVENT_BUTTON_PRESSED (one click),|

| | | |SCOL_GTK_EVENT_BUTTON_PRESSED2 (double click),|

| | | |SCOL_GTK_EVENT_BUTTON_PRESSED3 (triple click),|

| | | |SCOL_GTK_EVENT_BUTTON_RELEASE (button released).|

| | | |So you can make one function to several definitions|

|4. *button*|I|the mouse button|SCOL_GTK_EVENT_BUTTON_1,|

| | | |SCOL_GTK_EVENT_BUTTON_2,|

| | | |SCOL_GTK_EVENT_BUTTON_3,|

| | | |SCOL_GTK_EVENT_BUTTON_4,|

| | | |SCOL_GTK_EVENT_BUTTON_5,|

|5. *mask*|I|the mask of the modifier keys|SCOL_GTK_EVENT_KEY_SHIFT|

| | | |SCOL_GTK_EVENT_KEY_CONTROL,|

| | | |SCOL_GTK_EVENT_KEY_ALT,|

| | | |SCOL_GTK_EVENT_KEY_CAPS (can not work : system, window manager, ...)|

| | | |SCOL_GTK_EVENT_KEY_HYPER (can not work : system, window manager, ...)|

| | | |SCOL_GTK_EVENT_KEY_SUPER (can not work : system, window manager, ...)|

| | | |SCOL_GTK_EVENT_KEY_OTHER (or nothing)|

|6. *position*|I|the position of the click [x y], relative to the widget| |

h2. SCOL_GTK_WIDGET_BUTTONRELEASED

a mouse button has been released on a widget.

Prototype : *fun [ObjGtkWidget u0 I I I [I I]] u2*

See 'SCOL_GTK_WIDGET_BUTTONPRESSED' above.

h2. SCOL_GTK_WIDGET_MOVERESIZE

a window has moved and/or resized.

Prototype : *fun [ObjGtkWidget u0 [I I] [I I]] u2*

The supplementals parameters are two tuples :

# is the new position (x and y, relative at its parents or at the screen)

# is the new size (width and height)

h2. SCOL_GTK_WIDGET_DESTROY

when a widget (typically a window or all top level container) is destroyed (all reference are destroyed).

Prototype : *fun [ObjGtkWidget u0] u2*

Return [[Widgets]]