godot/scene/gui/link_button.cpp

/*************************************************************************/
/*  link_button.cpp                                                      */
/*************************************************************************/
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/*                           GODOT ENGINE                                */
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/* Copyright (c) 2007-2020 Juan Linietsky, Ariel Manzur.                 */
/* Copyright (c) 2014-2020 Godot Engine contributors (cf. AUTHORS.md).   */
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#include "link_button.h"

void LinkButton::set_text(const String &p_text) {
	text = p_text;
	update();
	minimum_size_changed();
}

String LinkButton::get_text() const {
	return text;
}

void LinkButton::set_underline_mode(UnderlineMode p_underline_mode) {
	underline_mode = p_underline_mode;
	update();
}

LinkButton::UnderlineMode LinkButton::get_underline_mode() const {
	return underline_mode;
}

Size2 LinkButton::get_minimum_size() const {
	return get_theme_font("font")->get_string_size(text);
}

void LinkButton::_notification(int p_what) {
	switch (p_what) {
		case NOTIFICATION_DRAW: {
			RID ci = get_canvas_item();
			Size2 size = get_size();
			Color color;
			bool do_underline = false;

			switch (get_draw_mode()) {
				case DRAW_NORMAL: {
					color = get_theme_color("font_color");
					do_underline = underline_mode == UNDERLINE_MODE_ALWAYS;
				} break;
				case DRAW_HOVER_PRESSED:
				case DRAW_PRESSED: {
					if (has_theme_color("font_color_pressed")) {
						color = get_theme_color("font_color_pressed");
					} else {
						color = get_theme_color("font_color");
					}

					do_underline = underline_mode != UNDERLINE_MODE_NEVER;

				} break;
				case DRAW_HOVER: {
					color = get_theme_color("font_color_hover");
					do_underline = underline_mode != UNDERLINE_MODE_NEVER;

				} break;
				case DRAW_DISABLED: {
					color = get_theme_color("font_color_disabled");
					do_underline = underline_mode == UNDERLINE_MODE_ALWAYS;

				} break;
			}

			if (has_focus()) {
				Ref<StyleBox> style = get_theme_stylebox("focus");
				style->draw(ci, Rect2(Point2(), size));
			}

			Ref<Font> font = get_theme_font("font");

			draw_string(font, Vector2(0, font->get_ascent()), text, color);

			if (do_underline) {
				int underline_spacing = get_theme_constant("underline_spacing") + font->get_underline_position();
				int width = font->get_string_size(text).width;
				int y = font->get_ascent() + underline_spacing;

				draw_line(Vector2(0, y), Vector2(width, y), color, font->get_underline_thickness());
			}

		} break;
	}
}

void LinkButton::_bind_methods() {
	ClassDB::bind_method(D_METHOD("set_text", "text"), &LinkButton::set_text);
	ClassDB::bind_method(D_METHOD("get_text"), &LinkButton::get_text);

	ClassDB::bind_method(D_METHOD("set_underline_mode", "underline_mode"), &LinkButton::set_underline_mode);
	ClassDB::bind_method(D_METHOD("get_underline_mode"), &LinkButton::get_underline_mode);

	BIND_ENUM_CONSTANT(UNDERLINE_MODE_ALWAYS);
	BIND_ENUM_CONSTANT(UNDERLINE_MODE_ON_HOVER);
	BIND_ENUM_CONSTANT(UNDERLINE_MODE_NEVER);

	ADD_PROPERTY(PropertyInfo(Variant::STRING, "text"), "set_text", "get_text");
	ADD_PROPERTY(PropertyInfo(Variant::INT, "underline", PROPERTY_HINT_ENUM, "Always,On Hover,Never"), "set_underline_mode", "get_underline_mode");
}

LinkButton::LinkButton() {
	underline_mode = UNDERLINE_MODE_ALWAYS;
	set_default_cursor_shape(CURSOR_POINTING_HAND);
}