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add aspect ratio lock feature to canvas window; user window.lockAspectRatio() to activate

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Henning Stahlke 2019-11-06 22:59:08 +01:00
parent b21ecb2315
commit 43efd64dd2
1 changed files with 24 additions and 2 deletions
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24
Nasal/canvas/gui.nas
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@ -88,6 +88,8 @@ var Window = {
m.setInt("content-size[0]", size[0]);
m.setInt("content-size[1]", size[1]);
m.setDouble("aspect-ratio", size[0]/size[1]);
m.setBool("lock-aspect-ratio", 0);
# TODO better default position
m.move(0,0);
@ -289,6 +291,9 @@ var Window = {
me._canvas.set("view[" ~ i ~ "]", size);
}
},
lockAspectRatio: func (lock=1) {
me.setBool("lock-aspect-ratio", lock);
},
# protected:
_onStateChange: func
{
@ -317,6 +322,7 @@ var Window = {
.dispatchEvent(event);
},
# private:
#mode 0 = value changed, +-1 add/remove node
_propCallback: func(child, mode)
{
if( !me._node.equals(child.getParent()) )
@ -394,12 +400,28 @@ var Window = {
var x = me.get("tf/t[0]");
var y = me.get("tf/t[1]");
var old_size = [me.get("size[0]"), me.get("size[1]")];
if (me.get("lock-aspect-ratio"))
{
var old_csize = [me.get("content-size[0]"), me.get("content-size[1]")];
var dx = old_size[0] - old_csize[0];
var dy = old_size[1] - old_csize[1];
var ar = me.get("aspect-ratio");
if (name == "resize-right")
me.set("resize-bottom", (me.get("resize-right") - dx) / ar + dy);
if (name == "resize-bottom")
me.set("resize-right", (me.get("resize-bottom") - dy)* ar + dx);
if (name == "resize-left")
me.set("resize-top", (me.get("resize-left"))/ ar );
if (name == "resize-top")
me.set("resize-left", (me.get("resize-top"))* ar );
}
var l = x + math.min(me.get("resize-left"), old_size[0] - min_size[0]);
var t = y + math.min(me.get("resize-top"), old_size[1] - min_size[1]);
var r = x + math.max(me.get("resize-right"), min_size[0]);
var b = y + math.max(me.get("resize-bottom"), min_size[1]);
if( is_status )
{
me._resize = child.getValue();