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godot/scene/gui/box_container.cpp

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/*************************************************************************/
/* box_container.cpp */
/*************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* http://www.godotengine.org */
/*************************************************************************/
/* Copyright (c) 2007-2016 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 "box_container.h"
#include "margin_container.h"
#include "label.h"
struct _MinSizeCache {
int min_size;
bool will_stretch;
int final_size;
};
void BoxContainer::_resort() {
/** First pass, determine minimum size AND amount of stretchable elements */
Size2i new_size=get_size();;
int sep=get_constant("separation");//,vertical?"VBoxContainer":"HBoxContainer");
bool first=true;
int children_count=0;
int stretch_min=0;
int stretch_avail=0;
float stretch_ratio_total=0;
Map<Control*,_MinSizeCache> min_size_cache;
for(int i=0;i<get_child_count();i++) {
Control *c=get_child(i)->cast_to<Control>();
if (!c || !c->is_visible())
continue;
if (c->is_set_as_toplevel())
continue;
Size2i size=c->get_combined_minimum_size();
_MinSizeCache msc;
if (vertical) { /* VERTICAL */
stretch_min+=size.height;
msc.min_size=size.height;
msc.will_stretch=c->get_v_size_flags() & SIZE_EXPAND;
} else { /* HORIZONTAL */
stretch_min+=size.width;
msc.min_size=size.width;
msc.will_stretch=c->get_h_size_flags() & SIZE_EXPAND;
}
if (msc.will_stretch) {
stretch_avail+=msc.min_size;
stretch_ratio_total+=c->get_stretch_ratio();
}
msc.final_size=msc.min_size;
min_size_cache[c]=msc;
children_count++;
}
if (children_count==0)
return;
int stretch_max = (vertical? new_size.height : new_size.width ) - (children_count-1) * sep;
int stretch_diff = stretch_max - stretch_min;
if (stretch_diff<0) {
//avoid negative stretch space
stretch_max=stretch_min;
stretch_diff=0;
}
stretch_avail+=stretch_diff; //available stretch space.
/** Second, pass sucessively to discard elements that can't be stretched, this will run while stretchable
elements exist */
bool has_stretched = false;
while(stretch_ratio_total>0) { // first of all, dont even be here if no stretchable objects exist
has_stretched = true;
bool refit_successful=true; //assume refit-test will go well
for(int i=0;i<get_child_count();i++) {
Control *c=get_child(i)->cast_to<Control>();
if (!c || !c->is_visible())
continue;
if (c->is_set_as_toplevel())
continue;
ERR_FAIL_COND(!min_size_cache.has(c));
_MinSizeCache &msc=min_size_cache[c];
if (msc.will_stretch) { //wants to stretch
//let's see if it can really stretch
int final_pixel_size=stretch_avail * c->get_stretch_ratio() / stretch_ratio_total;
if (final_pixel_size<msc.min_size) {
//if available stretching area is too small for widget,
//then remove it from stretching area
msc.will_stretch=false;
stretch_ratio_total-=c->get_stretch_ratio();
refit_successful=false;
stretch_avail-=msc.min_size;
msc.final_size=msc.min_size;
break;
} else {
msc.final_size=final_pixel_size;
}
}
}
if (refit_successful) //uf refit went well, break
break;
}
/** Final pass, draw and stretch elements **/
int ofs=0;
if (!has_stretched) {
switch (align) {
case ALIGN_BEGIN:
break;
case ALIGN_CENTER:
ofs = stretch_diff / 2;
break;
case ALIGN_END:
ofs = stretch_diff;
break;
}
}
first=true;
int idx=0;
for(int i=0;i<get_child_count();i++) {
Control *c=get_child(i)->cast_to<Control>();
if (!c || !c->is_visible())
continue;
if (c->is_set_as_toplevel())
continue;
_MinSizeCache &msc=min_size_cache[c];
if (first)
first=false;
else
ofs+=sep;
int from=ofs;
int to=ofs+msc.final_size;
if (msc.will_stretch && idx==children_count-1) {
//adjust so the last one always fits perfect
//compensating for numerical imprecision
to=vertical?new_size.height:new_size.width;
}
int size=to-from;
Rect2 rect;
if (vertical) {
rect=Rect2(0,from,new_size.width,size);
} else {
rect=Rect2(from,0,size,new_size.height);
}
fit_child_in_rect(c,rect);
ofs=to;
idx++;
}
}
Size2 BoxContainer::get_minimum_size() const {
/* Calculate MINIMUM SIZE */
Size2i minimum;
int sep=get_constant("separation");//,vertical?"VBoxContainer":"HBoxContainer");
bool first=true;
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->is_hidden()) {
continue;
}
Size2i size=c->get_combined_minimum_size();
if (vertical) { /* VERTICAL */
if ( size.width > minimum.width ) {
minimum.width=size.width;
}
minimum.height+=size.height+(first?0:sep);
} else { /* HORIZONTAL */
if ( size.height > minimum.height ) {
minimum.height=size.height;
}
minimum.width+=size.width+(first?0:sep);
}
first=false;
}
return minimum;
}
void BoxContainer::_notification(int p_what) {
switch(p_what) {
case NOTIFICATION_SORT_CHILDREN: {
_resort();
} break;
}
}
void BoxContainer::set_alignment(AlignMode p_align) {
align = p_align;
_resort();
}
BoxContainer::AlignMode BoxContainer::get_alignment() const {
return align;
}
void BoxContainer::add_spacer(bool p_begin) {
Control *c = memnew( Control );
c->set_stop_mouse(false);
if (vertical)
c->set_v_size_flags(SIZE_EXPAND_FILL);
else
c->set_h_size_flags(SIZE_EXPAND_FILL);
add_child(c);
if (p_begin)
move_child(c,0);
}
BoxContainer::BoxContainer(bool p_vertical) {
vertical=p_vertical;
align = ALIGN_BEGIN;
// set_ignore_mouse(true);
set_stop_mouse(false);
}
void BoxContainer::_bind_methods() {
ObjectTypeDB::bind_method(_MD("add_spacer","begin"),&BoxContainer::add_spacer);
ObjectTypeDB::bind_method(_MD("get_alignment"),&BoxContainer::get_alignment);
ObjectTypeDB::bind_method(_MD("set_alignment","alignment"),&BoxContainer::set_alignment);
BIND_CONSTANT( ALIGN_BEGIN );
BIND_CONSTANT( ALIGN_CENTER );
BIND_CONSTANT( ALIGN_END );
ADD_PROPERTY( PropertyInfo(Variant::INT,"alignment", PROPERTY_HINT_ENUM, "Begin,Center,End"), _SCS("set_alignment"),_SCS("get_alignment") );
}
MarginContainer* VBoxContainer::add_margin_child(const String& p_label,Control *p_control,bool p_expand) {
Label *l = memnew( Label );
l->set_text(p_label);
add_child(l);
MarginContainer *mc = memnew( MarginContainer );
mc->add_child(p_control);
add_child(mc);
if (p_expand)
mc->set_v_size_flags(SIZE_EXPAND_FILL);
return mc;
}
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