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godot/scene/gui/scroll_container.cpp

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/*************************************************************************/
/* scroll_container.cpp */
/*************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* http://www.godotengine.org */
/*************************************************************************/
/* Copyright (c) 2007-2017 Juan Linietsky, Ariel Manzur. */
/* */
/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the */
/* "Software"), to deal in the Software without restriction, including */
/* without limitation the rights to use, copy, modify, merge, publish, */
/* distribute, sublicense, and/or sell copies of the Software, and to */
/* permit persons to whom the Software is furnished to do so, subject to */
/* the following conditions: */
/* */
/* The above copyright notice and this permission notice shall be */
/* included in all copies or substantial portions of the Software. */
/* */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
/*************************************************************************/
#include "scroll_container.h"
#include "os/os.h"
bool ScrollContainer::clips_input() const {
return true;
}
Size2 ScrollContainer::get_minimum_size() const {
Size2 min_size;
for(int i=0;i<get_child_count();i++) {
Control *c = get_child(i)->cast_to<Control>();
if (!c)
continue;
if (c->is_set_as_toplevel())
continue;
if (c == h_scroll || c == v_scroll)
continue;
Size2 minsize = c->get_combined_minimum_size();
if (!scroll_h) {
min_size.x = MAX(min_size.x, minsize.x);
}
if (!scroll_v) {
min_size.y = MAX(min_size.y, minsize.y);
}
}
if (h_scroll->is_visible()) {
min_size.y+=h_scroll->get_minimum_size().y;
}
if (v_scroll->is_visible()) {
min_size.x+=v_scroll->get_minimum_size().x;
}
return min_size;
};
void ScrollContainer::_cancel_drag() {
set_fixed_process(false);
drag_touching_deaccel=false;
drag_touching=false;
drag_speed=Vector2();
drag_accum=Vector2();
last_drag_accum=Vector2();
drag_from=Vector2();
}
void ScrollContainer::_input_event(const InputEvent& p_input_event) {
switch(p_input_event.type) {
case InputEvent::MOUSE_BUTTON: {
const InputEventMouseButton &mb=p_input_event.mouse_button;
if (mb.button_index==BUTTON_WHEEL_UP && mb.pressed) {
if (h_scroll->is_visible() && !v_scroll->is_visible()){
// only horizontal is enabled, scroll horizontally
h_scroll->set_val( h_scroll->get_val()-h_scroll->get_page()/8 );
} else if (v_scroll->is_visible()) {
v_scroll->set_val( v_scroll->get_val()-v_scroll->get_page()/8 );
}
}
if (mb.button_index==BUTTON_WHEEL_DOWN && mb.pressed) {
if (h_scroll->is_visible() && !v_scroll->is_visible()){
// only horizontal is enabled, scroll horizontally
h_scroll->set_val( h_scroll->get_val()+h_scroll->get_page()/8 );
} else if (v_scroll->is_visible()) {
v_scroll->set_val( v_scroll->get_val()+v_scroll->get_page()/8 );
}
}
if(!OS::get_singleton()->has_touchscreen_ui_hint())
return;
if (mb.button_index!=BUTTON_LEFT)
break;
if (mb.pressed) {
if (drag_touching) {
set_fixed_process(false);
drag_touching_deaccel=false;
drag_touching=false;
drag_speed=Vector2();
drag_accum=Vector2();
last_drag_accum=Vector2();
drag_from=Vector2();
}
if (true) {
drag_speed=Vector2();
drag_accum=Vector2();
last_drag_accum=Vector2();
drag_from=Vector2(h_scroll->get_val(),v_scroll->get_val());
drag_touching=OS::get_singleton()->has_touchscreen_ui_hint();
drag_touching_deaccel=false;
time_since_motion=0;
if (drag_touching) {
set_fixed_process(true);
time_since_motion=0;
}
}
} else {
if (drag_touching) {
if (drag_speed==Vector2()) {
drag_touching_deaccel=false;
drag_touching=false;
set_fixed_process(false);
} else {
drag_touching_deaccel=true;
}
}
}
} break;
case InputEvent::MOUSE_MOTION: {
const InputEventMouseMotion &mm=p_input_event.mouse_motion;
if (drag_touching && ! drag_touching_deaccel) {
Vector2 motion = Vector2(mm.relative_x,mm.relative_y);
drag_accum-=motion;
Vector2 diff = drag_from+drag_accum;
if (scroll_h)
h_scroll->set_val(diff.x);
else
drag_accum.x=0;
if (scroll_v)
v_scroll->set_val(diff.y);
else
drag_accum.y=0;
time_since_motion=0;
}
} break;
}
}
void ScrollContainer::_update_scrollbar_pos() {
Size2 hmin = h_scroll->get_combined_minimum_size();
Size2 vmin = v_scroll->get_combined_minimum_size();
v_scroll->set_anchor_and_margin(MARGIN_LEFT,ANCHOR_END,vmin.width);
v_scroll->set_anchor_and_margin(MARGIN_RIGHT,ANCHOR_END,0);
v_scroll->set_anchor_and_margin(MARGIN_TOP,ANCHOR_BEGIN,0);
v_scroll->set_anchor_and_margin(MARGIN_BOTTOM,ANCHOR_END,0);
h_scroll->set_anchor_and_margin(MARGIN_LEFT,ANCHOR_BEGIN,0);
h_scroll->set_anchor_and_margin(MARGIN_RIGHT,ANCHOR_END,0);
h_scroll->set_anchor_and_margin(MARGIN_TOP,ANCHOR_END,hmin.height);
h_scroll->set_anchor_and_margin(MARGIN_BOTTOM,ANCHOR_END,0);
h_scroll->raise();
v_scroll->raise();
}
void ScrollContainer::_notification(int p_what) {
if (p_what == NOTIFICATION_ENTER_TREE || p_what == NOTIFICATION_THEME_CHANGED) {
call_deferred("_update_scrollbar_pos");
};
if (p_what==NOTIFICATION_SORT_CHILDREN) {
child_max_size = Size2(0, 0);
Size2 size = get_size();
if (h_scroll->is_visible())
size.y-=h_scroll->get_minimum_size().y;
if (v_scroll->is_visible())
size.x-=h_scroll->get_minimum_size().x;
for(int i=0;i<get_child_count();i++) {
Control *c = get_child(i)->cast_to<Control>();
if (!c)
continue;
if (c->is_set_as_toplevel())
continue;
if (c == h_scroll || c == v_scroll)
continue;
Size2 minsize = c->get_combined_minimum_size();
child_max_size.x = MAX(child_max_size.x, minsize.x);
child_max_size.y = MAX(child_max_size.y, minsize.y);
Rect2 r = Rect2(-scroll,minsize);
if (!scroll_h || (!h_scroll->is_visible() && c->get_h_size_flags()&SIZE_EXPAND)) {
r.pos.x=0;
if (c->get_h_size_flags()&SIZE_EXPAND)
r.size.width=MAX(size.width,minsize.width);
else
r.size.width=minsize.width;
}
if (!scroll_v || (!v_scroll->is_visible() && c->get_v_size_flags()&SIZE_EXPAND)) {
r.pos.y=0;
r.size.height=size.height;
if (c->get_v_size_flags()&SIZE_EXPAND)
r.size.height=MAX(size.height,minsize.height);
else
r.size.height=minsize.height;
}
fit_child_in_rect(c,r);
}
update();
};
if (p_what == NOTIFICATION_DRAW) {
update_scrollbars();
VisualServer::get_singleton()->canvas_item_set_clip(get_canvas_item(),true);
}
if (p_what==NOTIFICATION_FIXED_PROCESS) {
if (drag_touching) {
if (drag_touching_deaccel) {
Vector2 pos = Vector2(h_scroll->get_val(),v_scroll->get_val());
pos+=drag_speed*get_fixed_process_delta_time();
bool turnoff_h=false;
bool turnoff_v=false;
if (pos.x<0) {
pos.x=0;
turnoff_h=true;
}
if (pos.x > (h_scroll->get_max()-h_scroll->get_page())) {
pos.x=h_scroll->get_max()-h_scroll->get_page();
turnoff_h=true;
}
if (pos.y<0) {
pos.y=0;
turnoff_v=true;
}
if (pos.y > (v_scroll->get_max()-v_scroll->get_page())) {
pos.y=v_scroll->get_max()-v_scroll->get_page();
turnoff_v=true;
}
if (scroll_h)
h_scroll->set_val(pos.x);
if (scroll_v)
v_scroll->set_val(pos.y);
float sgn_x = drag_speed.x<0? -1 : 1;
float val_x = Math::abs(drag_speed.x);
val_x-=1000*get_fixed_process_delta_time();
if (val_x<0) {
turnoff_h=true;
}
float sgn_y = drag_speed.y<0? -1 : 1;
float val_y = Math::abs(drag_speed.y);
val_y-=1000*get_fixed_process_delta_time();
if (val_y<0) {
turnoff_v=true;
}
drag_speed=Vector2(sgn_x*val_x,sgn_y*val_y);
if (turnoff_h && turnoff_v) {
set_fixed_process(false);
drag_touching=false;
drag_touching_deaccel=false;
}
} else {
if (time_since_motion==0 || time_since_motion>0.1) {
Vector2 diff = drag_accum - last_drag_accum;
last_drag_accum=drag_accum;
drag_speed=diff/get_fixed_process_delta_time();
}
time_since_motion+=get_fixed_process_delta_time();
}
}
}
};
void ScrollContainer::update_scrollbars() {
Size2 size = get_size();
Size2 hmin = h_scroll->get_combined_minimum_size();
Size2 vmin = v_scroll->get_combined_minimum_size();
Size2 min = child_max_size;
if (!scroll_v || min.height <= size.height - hmin.height) {
v_scroll->hide();
scroll.y=0;
} else {
v_scroll->show();
scroll.y=v_scroll->get_val();
}
v_scroll->set_max(min.height);
v_scroll->set_page(size.height - hmin.height);
if (!scroll_h || min.width <= size.width - vmin.width) {
h_scroll->hide();
scroll.x=0;
} else {
h_scroll->show();
h_scroll->set_max(min.width);
h_scroll->set_page(size.width - vmin.width);
scroll.x=h_scroll->get_val();
}
}
void ScrollContainer::_scroll_moved(float) {
scroll.x=h_scroll->get_val();
scroll.y=v_scroll->get_val();
queue_sort();
update();
};
void ScrollContainer::set_enable_h_scroll(bool p_enable) {
scroll_h=p_enable;
queue_sort();
}
bool ScrollContainer::is_h_scroll_enabled() const{
return scroll_h;
}
void ScrollContainer::set_enable_v_scroll(bool p_enable) {
scroll_v=p_enable;
queue_sort();
}
bool ScrollContainer::is_v_scroll_enabled() const{
return scroll_v;
}
int ScrollContainer::get_v_scroll() const {
return v_scroll->get_val();
}
void ScrollContainer::set_v_scroll(int p_pos) {
v_scroll->set_val(p_pos);
_cancel_drag();
}
int ScrollContainer::get_h_scroll() const {
return h_scroll->get_val();
}
void ScrollContainer::set_h_scroll(int p_pos) {
h_scroll->set_val(p_pos);
_cancel_drag();
}
void ScrollContainer::_bind_methods() {
ObjectTypeDB::bind_method(_MD("_scroll_moved"),&ScrollContainer::_scroll_moved);
ObjectTypeDB::bind_method(_MD("_input_event"),&ScrollContainer::_input_event);
ObjectTypeDB::bind_method(_MD("set_enable_h_scroll","enable"),&ScrollContainer::set_enable_h_scroll);
ObjectTypeDB::bind_method(_MD("is_h_scroll_enabled"),&ScrollContainer::is_h_scroll_enabled);
ObjectTypeDB::bind_method(_MD("set_enable_v_scroll","enable"),&ScrollContainer::set_enable_v_scroll);
ObjectTypeDB::bind_method(_MD("is_v_scroll_enabled"),&ScrollContainer::is_v_scroll_enabled);
ObjectTypeDB::bind_method(_MD("_update_scrollbar_pos"),&ScrollContainer::_update_scrollbar_pos);
ObjectTypeDB::bind_method(_MD("set_h_scroll","val"),&ScrollContainer::set_h_scroll);
ObjectTypeDB::bind_method(_MD("get_h_scroll"),&ScrollContainer::get_h_scroll);
ObjectTypeDB::bind_method(_MD("set_v_scroll","val"),&ScrollContainer::set_v_scroll);
ObjectTypeDB::bind_method(_MD("get_v_scroll"),&ScrollContainer::get_v_scroll);
ADD_PROPERTY( PropertyInfo( Variant::BOOL, "scroll/horizontal"), _SCS("set_enable_h_scroll"),_SCS("is_h_scroll_enabled"));
ADD_PROPERTY( PropertyInfo( Variant::BOOL, "scroll/vertical"), _SCS("set_enable_v_scroll"),_SCS("is_v_scroll_enabled"));
};
ScrollContainer::ScrollContainer() {
h_scroll = memnew(HScrollBar);
h_scroll->set_name("_h_scroll");
add_child(h_scroll);
v_scroll = memnew(VScrollBar);
v_scroll->set_name("_v_scroll");
add_child(v_scroll);
h_scroll->connect("value_changed", this,"_scroll_moved");
v_scroll->connect("value_changed", this,"_scroll_moved");
drag_speed=Vector2();
drag_touching=false;
drag_touching_deaccel=false;
scroll_h=true;
scroll_v=true;
};
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