ui/winui/button.cpp

/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright 2023 Olaf Wintermann. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *   1. Redistributions of source code must retain the above copyright
 *      notice, this list of conditions and the following disclaimer.
 *
 *   2. Redistributions in binary form must reproduce the above copyright
 *      notice, this list of conditions and the following disclaimer in the
 *      documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */


#include "button.h"

#include "util.h"
#include "container.h"

#include "../common/object.h"
#include "../common/context.h"

using namespace winrt;
using namespace Microsoft::UI::Xaml;
using namespace Microsoft::UI::Xaml::Controls;
using namespace Windows::UI::Xaml::Interop;
using namespace winrt::Windows::Foundation;
using namespace winrt::Microsoft::UI::Xaml::Controls::Primitives;


static void set_button_label(ButtonBase button, const char* label, const char* stockid) {
	if (label) {
		wchar_t* wlabel = str2wstr(label, nullptr);
		button.Content(box_value(wlabel));
		free(wlabel);
	}
	// TODO: stockid
}


UIWIDGET ui_button_create(UiObject* obj, UiButtonArgs args) {
	UiObject* current = uic_current_obj(obj);

	// create button with label
	Button button = Button();
	set_button_label(button, args.label, args.stockid);

	// create toolkit wrapper object and register destructor
	UIElement elm = button;
	UiWidget* widget = new UiWidget(elm);
	ui_context_add_widget_destructor(current->ctx, widget);

	// register callback
	if (args.onclick) {
		widget->obj = obj;
		widget->event_func = (ui_eventfunc)args.onclick;
		widget->event_data = args.onclickdata;
		button.Click([widget](IInspectable const& sender, RoutedEventArgs) {
			ui_callback cb = (ui_callback)widget->event_func;

			UiEvent evt;
			evt.obj = (UiObject*)widget->obj;
			evt.window = evt.obj->window;
			evt.document = evt.obj->ctx->document;
			evt.eventdata = nullptr;
			evt.intval = 0;
			cb(&evt, widget->event_data);
			});
	}

	// add button to current container
	UI_APPLY_LAYOUT1(current, args);

	current->container->Add(button, false);

	return widget;
}


static void togglebutton_register_checked_observers(ToggleButton button, UiObject* obj, UiVar* var) {
	button.Checked([button, obj, var](IInspectable const& sender, RoutedEventArgs) {
		UiInteger* i = (UiInteger*)var->value;
		UiEvent evt = ui_create_int_event(obj, i->get(i));
		ui_notify_evt(i->observers, &evt);
		});
}

static void togglebutton_register_unchecked_observers(ToggleButton button, UiObject* obj, UiVar* var) {
	button.Unchecked([button, obj, var](IInspectable const& sender, RoutedEventArgs) {
		UiInteger* i = (UiInteger*)var->value;
		UiEvent evt = ui_create_int_event(obj, i->get(i));
		ui_notify_evt(i->observers, &evt);
		});
}

static void togglebutton_register_callback(ToggleButton button, UiObject *obj, UiToggleArgs& args) {
	ui_callback callback = args.onchange;
	void* cbdata = args.onchangedata;
	if (callback) {
		button.Checked([button, obj, callback, cbdata](IInspectable const& sender, RoutedEventArgs) {
			UiEvent evt = ui_create_int_event(obj, true);
			callback(&evt, cbdata);
			});
		button.Unchecked([button, obj, callback, cbdata](IInspectable const& sender, RoutedEventArgs) {
			UiEvent evt = ui_create_int_event(obj, false);
			callback(&evt, cbdata);
			});
	}
}

static UIWIDGET create_togglebutton(UiObject *obj, ToggleButton button, UiToggleArgs args) {
	UiObject* current = uic_current_obj(obj);

	// set label
	set_button_label(button, args.label, args.stockid);
	togglebutton_register_callback(button, obj, args);

	// create toolkit wrapper object and register destructor
	UIElement elm = button;
	UiWidget* widget = new UiWidget(elm);
	ui_context_add_widget_destructor(current->ctx, widget);

	// bind variable
	UiVar* var = nullptr;
	if (args.value) {
		var = uic_create_value_var(current->ctx, args.value);
	}
	else if (args.varname) {
		var = uic_create_var(obj->ctx, args.varname, UI_VAR_INTEGER);
	}
	if (var) {
		UiInteger* value = (UiInteger*)var->value;
		value->obj = widget;
		value->get = ui_toggle_button_get;
		value->set = ui_toggle_button_set;

		// listener for notifying observers
		togglebutton_register_checked_observers(button, obj, var);
		togglebutton_register_unchecked_observers(button, obj, var);
	}

	// add button to current container
	UI_APPLY_LAYOUT1(current, args);

	current->container->Add(button, false);

	return widget;
}

UIWIDGET ui_togglebutton_create(UiObject* obj, UiToggleArgs args) {
	ToggleButton button = ToggleButton();
	return create_togglebutton(obj, button, args);
}

UIWIDGET ui_checkbox_create(UiObject* obj, UiToggleArgs args) {
	CheckBox button = CheckBox();
	return create_togglebutton(obj, button, args);
}

UIWIDGET ui_radiobutton_create(UiObject* obj, UiToggleArgs args) {
	RadioButton button = RadioButton();

	UiObject* current = uic_current_obj(obj);

	// set label
	set_button_label(button, args.label, args.stockid);
	togglebutton_register_callback(button, obj, args);

	// create toolkit wrapper object and register destructor
	UIElement elm = button;
	UiWidget* widget = new UiWidget(elm);
	ui_context_add_widget_destructor(current->ctx, widget);

	UiVar* var = nullptr;
	if (args.value) {
		var = uic_create_value_var(current->ctx, args.value);
	}
	else if (args.varname) {
		var = uic_create_var(obj->ctx, args.varname, UI_VAR_INTEGER);
	}

	// bind radio button to the value
	if (var) {
		UiInteger* value = (UiInteger*)var->value;

		// store a list of radio buttons in the value
		CxList* radioButtons = (CxList*) (value->obj ? value->obj : cxLinkedListCreate(current->ctx->allocator, NULL, CX_STORE_POINTERS));
		// get or create the group name
		static int groupCount = 0;
		winrt::hstring groupName;
		if (radioButtons->size == 0) {
			groupName = winrt::to_hstring(groupCount++);
		} else {
			UiWidget* firstButtonWidget = (UiWidget*)cxListAt(radioButtons, 0);
			RadioButton firstRadioButton = firstButtonWidget->uielement.as<RadioButton>();
			groupName = firstRadioButton.GroupName();
		}

		// set the group name for the new radiobutton
		cxListAdd(radioButtons, widget);
		button.GroupName(groupName);

		value->obj = radioButtons;
		value->get = ui_radio_button_get;
		value->set = ui_radio_button_set;

		// listener for notifying observers (only checked, not unchecked)
		togglebutton_register_checked_observers(button, obj, var);
	}

	// add button to current container
	UI_APPLY_LAYOUT1(current, args);

	current->container->Add(button, false);

	return widget;
}


int64_t ui_toggle_button_get(UiInteger* integer) {
	UiWidget* widget = (UiWidget*)integer->obj;
	ToggleButton toggleButton = widget->uielement.as<ToggleButton>();
	int val = toggleButton.IsChecked().GetBoolean();
	integer->value = val;
	return val;
}

void ui_toggle_button_set(UiInteger* integer, int64_t value) {
	UiWidget* widget = (UiWidget*)integer->obj;
	ToggleButton toggleButton = widget->uielement.as<ToggleButton>();
	toggleButton.IsChecked((bool)value);
	integer->value = value;
}

extern "C" int64_t ui_radio_button_get(UiInteger * integer) {
	CxList* list = (CxList*)integer->obj;
	CxIterator i = cxListIterator(list);
	int selection = -1;
	cx_foreach(UiWidget*, widget, i) {
		ToggleButton button = widget->uielement.as<ToggleButton>();
		if (button.IsChecked().GetBoolean()) {
			selection = i.index;
			break;
		}
	}
	integer->value = selection;
	return selection;
}

extern "C" void ui_radio_button_set(UiInteger * integer, int64_t value) {
	CxList* list = (CxList*)integer->obj;
	UiWidget* widget = (UiWidget*)cxListAt(list, value);
	if (widget) {
		ToggleButton button = widget->uielement.as<ToggleButton>();
		button.IsChecked(true);
		integer->value = value;
	}
}