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Added the framework code for handling keyboard events in GTK+ Areas. Oh boy... this is gonna hurt (as I will describe shortly).

This commit is contained in:
Pietro Gagliardi 2014-03-18 12:44:21 -04:00
parent ac684b15a5
commit 92dc282ffd
2 changed files with 25 additions and 0 deletions
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23
area_unix.go
View File

@ -7,6 +7,7 @@ package ui
import ( import (
"unsafe" "unsafe"
"image" "image"
"fmt"
) )
// #cgo pkg-config: gtk+-3.0 // #cgo pkg-config: gtk+-3.0
@ -15,6 +16,8 @@ import (
// extern gboolean our_area_button_press_event_callback(GtkWidget *, GdkEvent *, gpointer); // extern gboolean our_area_button_press_event_callback(GtkWidget *, GdkEvent *, gpointer);
// extern gboolean our_area_button_release_event_callback(GtkWidget *, GdkEvent *, gpointer); // extern gboolean our_area_button_release_event_callback(GtkWidget *, GdkEvent *, gpointer);
// extern gboolean our_area_motion_notify_event_callback(GtkWidget *, GdkEvent *, gpointer); // extern gboolean our_area_motion_notify_event_callback(GtkWidget *, GdkEvent *, gpointer);
// extern gboolean our_area_key_press_event_callback(GtkWidget *, GdkEvent *, gpointer);
// extern gboolean our_area_key_release_event_callback(GtkWidget *, GdkEvent *, gpointer);
// /* HACK - see https://code.google.com/p/go/issues/detail?id=7548 */ // /* HACK - see https://code.google.com/p/go/issues/detail?id=7548 */
// struct _cairo {}; // struct _cairo {};
import "C" import "C"
@ -25,6 +28,8 @@ func gtkAreaNew() *gtkWidget {
// we need to explicitly subscribe to mouse events with GtkDrawingArea // we need to explicitly subscribe to mouse events with GtkDrawingArea
C.gtk_widget_add_events(drawingarea, C.gtk_widget_add_events(drawingarea,
C.GDK_BUTTON_PRESS_MASK | C.GDK_BUTTON_RELEASE_MASK | C.GDK_POINTER_MOTION_MASK | C.GDK_BUTTON_MOTION_MASK) C.GDK_BUTTON_PRESS_MASK | C.GDK_BUTTON_RELEASE_MASK | C.GDK_POINTER_MOTION_MASK | C.GDK_BUTTON_MOTION_MASK)
// and we need to allow focusing on a GtkDrawingArea to enable keyboard events
C.gtk_widget_set_can_focus(drawingarea, C.TRUE)
scrollarea := C.gtk_scrolled_window_new((*C.GtkAdjustment)(nil), (*C.GtkAdjustment)(nil)) scrollarea := C.gtk_scrolled_window_new((*C.GtkAdjustment)(nil), (*C.GtkAdjustment)(nil))
// need a viewport because GtkDrawingArea isn't natively scrollable // need a viewport because GtkDrawingArea isn't natively scrollable
C.gtk_scrolled_window_add_with_viewport((*C.GtkScrolledWindow)(unsafe.Pointer(scrollarea)), drawingarea) C.gtk_scrolled_window_add_with_viewport((*C.GtkScrolledWindow)(unsafe.Pointer(scrollarea)), drawingarea)
@ -151,3 +156,21 @@ func our_area_motion_notify_event_callback(widget *C.GtkWidget, event *C.GdkEven
} }
var area_motion_notify_event_callback = C.GCallback(C.our_area_motion_notify_event_callback) var area_motion_notify_event_callback = C.GCallback(C.our_area_motion_notify_event_callback)
//export our_area_key_press_event_callback
func our_area_key_press_event_callback(widget *C.GtkWidget, event *C.GdkEvent, data C.gpointer) C.gboolean {
e := (*C.GdkEventKey)(unsafe.Pointer(event))
fmt.Printf("PRESS %#v\n", e)
return C.FALSE // TODO really false?
}
var area_key_press_event_callback = C.GCallback(C.our_area_key_press_event_callback)
//export our_area_key_release_event_callback
func our_area_key_release_event_callback(widget *C.GtkWidget, event *C.GdkEvent, data C.gpointer) C.gboolean {
e := (*C.GdkEventKey)(unsafe.Pointer(event))
fmt.Printf("RELEASE %#v\n", e)
return C.FALSE // TODO really false?
}
var area_key_release_event_callback = C.GCallback(C.our_area_key_release_event_callback)

2
sysdata_unix.go
View File

@ -102,6 +102,8 @@ var classTypes = [nctypes]*classData{
"button-press-event": area_button_press_event_callback, "button-press-event": area_button_press_event_callback,
"button-release-event": area_button_release_event_callback, "button-release-event": area_button_release_event_callback,
"motion-notify-event": area_motion_notify_event_callback, "motion-notify-event": area_motion_notify_event_callback,
"key-press-event": area_key_press_event_callback,
"key-release-event": area_key_release_event_callback,
}, },
}, },
} }