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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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68
src/api-impl-jni/views/android_view_ViewGroup.c
View File

@@ -8,6 +8,62 @@
#include "../generated_headers/android_view_ViewGroup.h"
#include "../generated_headers/android_view_View.h"
#define MEASURE_SPEC_EXACTLY (1 << 30)
struct _AndroidLayout {
GtkLayoutManager parent_instance;
jobject view;
};
G_DECLARE_FINAL_TYPE(AndroidLayout, android_layout, ATL, ANDROID_LAYOUT, GtkLayoutManager);
static void android_layout_measure(GtkLayoutManager *layout_manager, GtkWidget *widget, GtkOrientation orientation, int for_size, int *minimum, int *natural, int *minimum_baseline, int *natural_baseline) {
AndroidLayout *layout = ATL_ANDROID_LAYOUT(layout_manager);
JNIEnv *env = get_jni_env();
if (orientation == GTK_ORIENTATION_HORIZONTAL) {
*minimum = (*env)->CallIntMethod(env, layout->view, handle_cache.view.getSuggestedMinimumWidth);
*natural = (*env)->CallIntMethod(env, layout->view, handle_cache.view.getMeasuredWidth);
}
if (orientation == GTK_ORIENTATION_VERTICAL) {
*minimum = (*env)->CallIntMethod(env, layout->view, handle_cache.view.getSuggestedMinimumHeight);
*natural = (*env)->CallIntMethod(env, layout->view, handle_cache.view.getMeasuredHeight);
}
if (*natural < *minimum)
*natural = *minimum;
*minimum_baseline = -1;
*natural_baseline = -1;
}
static void android_layout_allocate(GtkLayoutManager *layout_manager, GtkWidget *widget, int width, int height, int baseline) {
AndroidLayout *layout = ATL_ANDROID_LAYOUT(layout_manager);
JNIEnv *env = get_jni_env();
(*env)->CallVoidMethod(env, layout->view, handle_cache.view.onMeasure, MEASURE_SPEC_EXACTLY | width, MEASURE_SPEC_EXACTLY | height);
if((*env)->ExceptionCheck(env))
(*env)->ExceptionDescribe(env);
(*env)->CallVoidMethod(env, layout->view, handle_cache.view.onLayout, TRUE, 0, 0, width, height);
if((*env)->ExceptionCheck(env))
(*env)->ExceptionDescribe(env);
}
static void android_layout_class_init(AndroidLayoutClass *klass) {
klass->parent_class.measure = android_layout_measure;
klass->parent_class.allocate = android_layout_allocate;
}
static void android_layout_init(AndroidLayout *self) {
}
G_DEFINE_TYPE(AndroidLayout, android_layout, GTK_TYPE_LAYOUT_MANAGER)
static GtkLayoutManager *android_layout_new(jobject view) {
AndroidLayout *layout = g_object_new(android_layout_get_type(), NULL);
layout->view = view;
return &layout->parent_instance;
}
/**
* Should be overwritten by ViewGroup subclasses.
* Fall back to vertical GtkBox if subclass is not implemented yet
@@ -17,7 +73,17 @@ JNIEXPORT jlong JNICALL Java_android_view_ViewGroup_native_1constructor(JNIEnv *
GtkWidget *wrapper = g_object_ref(wrapper_widget_new());
GtkWidget *box = gtk_box_new(GTK_ORIENTATION_VERTICAL, 1); // spacing of 1
wrapper_widget_set_child(WRAPPER_WIDGET(wrapper), box);
gtk_widget_set_name(GTK_WIDGET(box), "ViewGroup");
const char *name = _CSTRING((*env)->CallObjectMethod(env, _CLASS(this),
_METHOD((*env)->FindClass(env, "java/lang/Class"), "getName", "()Ljava/lang/String;")));
gtk_widget_set_name(box, name);
jmethodID measure_method = _METHOD(_CLASS(this), "onMeasure", "(II)V");
jmethodID layout_method = _METHOD(_CLASS(this), "onLayout", "(ZIIII)V");
if (measure_method != handle_cache.view.onMeasure || layout_method != handle_cache.view.onLayout) {
gtk_widget_set_layout_manager(box, android_layout_new(_REF(this)));
}
return _INTPTR(box);
}