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add support for ViewGroups with custom onLayout()

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A custom GtkLayoutManager is set to these objects, which calls into the
java handlers when measure or layout is requested.

Androids onMeasure method is quite different from GTKs measure method,
because Android already defines the final size during onMeasure.
Therefore, we call onMeasure from GTKs allocate callback instead of the
measure callback.
This commit is contained in:
Julian Winkler
2023-08-22 14:18:33 +02:00
parent 4434de4a58
commit ca975a0e7c
8 changed files with 268 additions and 11 deletions
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41
src/api-impl-jni/views/android_view_View.c
View File

@@ -196,3 +196,44 @@ JNIEXPORT void JNICALL Java_android_view_View_native_1destructor(JNIEnv *env, jo
{
g_object_unref(gtk_widget_get_parent(_PTR(widget_ptr)));
}
#define MEASURE_SPEC_UNSPECIFIED (0 << 30)
#define MEASURE_SPEC_EXACTLY (1 << 30)
#define MEASURE_SPEC_MASK (0x3 << 30)
JNIEXPORT void JNICALL Java_android_view_View_native_1measure(JNIEnv *env, jobject this, jlong widget_ptr, jint width_spec, jint height_spec) {
int width;
int height;
int for_size;
GtkWidget *widget = gtk_widget_get_parent(GTK_WIDGET(_PTR(widget_ptr)));
if (((height_spec & MEASURE_SPEC_MASK) == MEASURE_SPEC_EXACTLY) && ((width_spec & MEASURE_SPEC_MASK) == MEASURE_SPEC_EXACTLY)) {
width = width_spec & ~MEASURE_SPEC_MASK;
height = height_spec & ~MEASURE_SPEC_MASK;
} else {
for_size = ((height_spec & MEASURE_SPEC_MASK) == MEASURE_SPEC_EXACTLY) ? (height_spec & ~MEASURE_SPEC_MASK) : -1;
gtk_widget_measure(widget, GTK_ORIENTATION_HORIZONTAL, for_size, NULL, &width, NULL, NULL);
for_size = ((width_spec & MEASURE_SPEC_MASK) == MEASURE_SPEC_EXACTLY) ? (width_spec & ~MEASURE_SPEC_MASK) : -1;
gtk_widget_measure(widget, GTK_ORIENTATION_VERTICAL, for_size, NULL, &height, NULL, NULL);
}
(*env)->CallVoidMethod(env, this, handle_cache.view.setMeasuredDimension, width, height);
}
JNIEXPORT void JNICALL Java_android_view_View_native_1layout(JNIEnv *env, jobject this, jlong widget_ptr, jint l, jint t, jint r, jint b) {
GtkWidget *widget = gtk_widget_get_parent(GTK_WIDGET(_PTR(widget_ptr)));
GtkAllocation allocation = {
.x=l,
.y=t,
.width=r-l,
.height=b-t,
};
gtk_widget_size_allocate(widget, &allocation, -1);
}
JNIEXPORT void JNICALL Java_android_view_View_native_1requestLayout(JNIEnv *env, jobject this, jlong widget_ptr) {
GtkWidget *widget = GTK_WIDGET(_PTR(widget_ptr));
gtk_widget_queue_resize(widget);
}