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implement View.onInterceptTouchEvent() callback

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This is needed to support nested scrolling

A second GtkEventControllerLegacy gets registerd with GTK_PHASE_CAPTURE
This commit is contained in:
Julian Winkler
2024-02-24 18:50:03 +01:00
parent c03fb93727
commit 8dafa41ea9
7 changed files with 79 additions and 8 deletions
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58
src/api-impl-jni/views/android_view_View.c
View File

@@ -1,4 +1,5 @@
#include <gtk/gtk.h>
#include <stdio.h>
#include "../defines.h"
#include "../util.h"
@@ -10,9 +11,9 @@
#define SOURCE_TOUCHSCREEN 0x1002
struct touch_callback_data { JavaVM *jvm; jobject this; jobject on_touch_listener; jclass on_touch_listener_class;};
struct touch_callback_data { JavaVM *jvm; jobject this; jobject on_touch_listener; jclass on_touch_listener_class; bool intercepted; };
static bool call_ontouch_callback(int action, double x, double y, struct touch_callback_data *d)
static bool call_ontouch_callback(int action, double x, double y, struct touch_callback_data *d, GtkPropagationPhase phase)
{
bool ret;
JNIEnv *env;
@@ -20,8 +21,10 @@ static bool call_ontouch_callback(int action, double x, double y, struct touch_c
jobject motion_event = (*env)->NewObject(env, handle_cache.motion_event.class, handle_cache.motion_event.constructor, SOURCE_TOUCHSCREEN, action, (float)x, (float)y);
/* NULL listener means the callback was registered for onTouchEvent */
if(d->on_touch_listener)
if (phase == GTK_PHASE_CAPTURE && !d->intercepted) {
d->intercepted = (*env)->CallBooleanMethod(env, d->this, handle_cache.view.onInterceptTouchEvent, motion_event);
ret = d->intercepted;
} else if(d->on_touch_listener) /* NULL listener means the callback was registered for onTouchEvent */
ret = (*env)->CallBooleanMethod(env, d->on_touch_listener, _METHOD(d->on_touch_listener_class, "onTouch", "(Landroid/view/View;Landroid/view/MotionEvent;)Z"), d->this, motion_event);
else
ret = (*env)->CallBooleanMethod(env, d->this, _METHOD(d->on_touch_listener_class, "onTouchEvent", "(Landroid/view/MotionEvent;)Z"), motion_event);
@@ -30,6 +33,9 @@ static bool call_ontouch_callback(int action, double x, double y, struct touch_c
(*env)->ExceptionDescribe(env);
(*env)->DeleteLocalRef(env, motion_event);
if (action == MOTION_EVENT_ACTION_UP)
d->intercepted = false;
return ret;
}
static void gdk_event_get_widget_relative_position(GdkEvent *event, GtkWidget *widget, double *x, double *y)
@@ -49,25 +55,26 @@ static gboolean on_event(GtkEventControllerLegacy *event_controller, GdkEvent *e
double y;
GtkWidget *widget = gtk_event_controller_get_widget(GTK_EVENT_CONTROLLER(event_controller));
GtkPropagationPhase phase = gtk_event_controller_get_propagation_phase(GTK_EVENT_CONTROLLER(event_controller));
// TODO: this doesn't work for multitouch
switch(gdk_event_get_event_type(event)) {
case GDK_BUTTON_PRESS:
case GDK_TOUCH_BEGIN:
gdk_event_get_widget_relative_position(event, widget, &x, &y);
return call_ontouch_callback(MOTION_EVENT_ACTION_DOWN, x, y, d);
return call_ontouch_callback(MOTION_EVENT_ACTION_DOWN, x, y, d, phase);
break;
case GDK_BUTTON_RELEASE:
case GDK_TOUCH_END:
gdk_event_get_widget_relative_position(event, widget, &x, &y);
return call_ontouch_callback(MOTION_EVENT_ACTION_UP, x, y, d);
return call_ontouch_callback(MOTION_EVENT_ACTION_UP, x, y, d, phase);
break;
case GDK_MOTION_NOTIFY:
if (!(gdk_event_get_modifier_state(event) & GDK_BUTTON1_MASK))
break;
case GDK_TOUCH_UPDATE:
gdk_event_get_widget_relative_position(event, widget, &x, &y);
return call_ontouch_callback(MOTION_EVENT_ACTION_MOVE, x, y, d);
return call_ontouch_callback(MOTION_EVENT_ACTION_MOVE, x, y, d, phase);
break;
default:
break;
@@ -130,6 +137,20 @@ void _setOnTouchListener(JNIEnv *env, jobject this, GtkWidget *widget, jobject o
g_signal_connect(controller, "event", G_CALLBACK(on_event), callback_data);
gtk_widget_add_controller(widget, controller);
g_object_set_data(G_OBJECT(widget), "on_touch_listener", controller);
jmethodID onintercepttouchevent_method = _METHOD(_CLASS(this), "onInterceptTouchEvent", "(Landroid/view/MotionEvent;)Z");
if (onintercepttouchevent_method != handle_cache.view.onInterceptTouchEvent) {
GtkEventController *old_controller = g_object_get_data(G_OBJECT(widget), "on_intercept_touch_listener");
if(old_controller)
gtk_widget_remove_controller(widget, old_controller);
GtkEventController *controller = GTK_EVENT_CONTROLLER(gtk_event_controller_legacy_new());
gtk_event_controller_set_propagation_phase(controller, GTK_PHASE_CAPTURE);
g_signal_connect(controller, "event", G_CALLBACK(on_event), callback_data);
gtk_widget_add_controller(widget, controller);
g_object_set_data(G_OBJECT(widget), "on_intercept_touch_listener", controller);
}
}
JNIEXPORT void JNICALL Java_android_view_View_setOnTouchListener(JNIEnv *env, jobject this, jobject on_touch_listener)
@@ -418,3 +439,26 @@ JNIEXPORT void JNICALL Java_android_view_View_native_1setBackgroundDrawable(JNIE
GdkPaintable *paintable = GDK_PAINTABLE(_PTR(paintable_ptr));
wrapper_widget_set_background(WRAPPER_WIDGET(gtk_widget_get_parent(widget)), paintable);
}
JNIEXPORT jboolean JNICALL Java_android_view_View_native_1getGlobalVisibleRect(JNIEnv *env, jobject this, jlong widget_ptr, jobject rect) {
GtkWidget *widget = GTK_WIDGET(_PTR(widget_ptr));
graphene_point_t point_in = {0, 0};
graphene_point_t point_out;
double off_x;
double off_y;
gboolean ret;
GtkWidget *window = GTK_WIDGET(gtk_widget_get_native(widget));
gtk_native_get_surface_transform(GTK_NATIVE(window), &off_x, &off_y);
ret = gtk_widget_compute_point(widget, window, &point_in, &point_out);
if (!ret)
return false;
_SET_INT_FIELD(rect, "left", point_out.x - off_x);
_SET_INT_FIELD(rect, "top", point_out.y - off_y);
point_in = (graphene_point_t){gtk_widget_get_width(widget), gtk_widget_get_height(widget)};
ret = gtk_widget_compute_point(widget, window, &point_in, &point_out);
if (!ret)
return false;
_SET_INT_FIELD(rect, "right", point_out.x - off_x);
_SET_INT_FIELD(rect, "bottom", point_out.y - off_y);
return true;
}