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Boxselector is resizable #192

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merged 4 commits into from May 2, 2012
Merged

Boxselector is resizable #192

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8e6e57d
Split boxselecter adjustments
ansis Apr 28, 2012
edd33c8
Boxselector now resizable
ansis Apr 28, 2012
2711c2a
Cursor changes for boxselector resizing
ansis Apr 29, 2012
d220e43
Some boxselector simplification
ansis Apr 29, 2012
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111 changes: 89 additions & 22 deletions control/mm/boxselector.js
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Expand Up @@ -4,11 +4,17 @@ wax.mm = wax.mm || {};
// Box Selector
// ------------
wax.mm.boxselector = function(map, tilejson, opts) {
var mouseDownPoint = null,
var corner = null,
nearCorner = null,
callback = ((typeof opts === 'function') ?
opts :
opts.callback),
boxDiv,
style,
borderWidth = 0,
horizontal = false, // Whether the resize is horizontal
vertical = false,
edge = 5, // Distance from border sensitive to resizing
addEvent = MM.addEvent,
removeEvent = MM.removeEvent,
box,
Expand All @@ -32,42 +38,73 @@ wax.mm.boxselector = function(map, tilejson, opts) {
function mouseDown(e) {
if (!e.shiftKey) return;

mouseDownPoint = getMousePoint(e);
corner = nearCorner = getMousePoint(e);
horizontal = vertical = true;

boxDiv.style.left = mouseDownPoint.x + 'px';
boxDiv.style.top = mouseDownPoint.y + 'px';
style.left = corner.x + 'px';
style.top = corner.y + 'px';
style.width = style.height = 0;

addEvent(map.parent, 'mousemove', mouseMove);
addEvent(map.parent, 'mouseup', mouseUp);
addEvent(document, 'mousemove', mouseMove);
addEvent(document, 'mouseup', mouseUp);

map.parent.style.cursor = 'crosshair';
return MM.cancelEvent(e);
}

// Resize existing box
function mouseDownResize(e) {
var point = getMousePoint(e),
TL = {
x: parseInt(boxDiv.offsetLeft),
y: parseInt(boxDiv.offsetTop)
},
BR = {
x: TL.x + parseInt(boxDiv.offsetWidth),
y: TL.y + parseInt(boxDiv.offsetHeight)
};

// Determine whether resize is horizontal, vertical or both
horizontal = point.x - TL.x <= edge || BR.x - point.x <= edge;
vertical = point.y - TL.y <= edge || BR.y - point.y <= edge;

if (vertical || horizontal) {
corner = {
x: (point.x - TL.x < BR.x - point.x) ? BR.x : TL.x,
y: (point.y - TL.y < BR.y - point.y) ? BR.y : TL.y
};
nearCorner = {
x: (point.x - TL.x < BR.x - point.x) ? TL.x : BR.x,
y: (point.y - TL.y < BR.y - point.y) ? TL.y : BR.y
}
addEvent(document, 'mousemove', mouseMove);
addEvent(document, 'mouseup', mouseUp);
return MM.cancelEvent(e);
}
}

function mouseMove(e) {
var point = getMousePoint(e),
style = boxDiv.style;
var point = getMousePoint(e);
style.display = 'block';
if (point.x < mouseDownPoint.x) {
style.left = point.x + 'px';
} else {
style.left = mouseDownPoint.x + 'px';
if (horizontal) {
style.left = (point.x < corner.x ? point.x : corner.x) + 'px';
style.width = Math.abs(point.x - corner.x) - 2 * borderWidth + 'px';
}
if (point.y < mouseDownPoint.y) {
style.top = point.y + 'px';
} else {
style.top = mouseDownPoint.y + 'px';
if (vertical) {
style.top = (point.y < corner.y ? point.y : corner.y) + 'px';
style.height = Math.abs(point.y - corner.y) - 2 * borderWidth + 'px';
}
style.width = Math.abs(point.x - mouseDownPoint.x) + 'px';
style.height = Math.abs(point.y - mouseDownPoint.y) + 'px';
changeCursor(point, map.parent);
return MM.cancelEvent(e);
}

function mouseUp(e) {
var point = getMousePoint(e),
l1 = map.pointLocation(point),
l2 = map.pointLocation(mouseDownPoint);
l1 = map.pointLocation( new MM.Point(
horizontal ? point.x : nearCorner.x,
vertical? point.y : nearCorner.y
));
l2 = map.pointLocation(corner);

// Format coordinates like mm.map.getExtent().
boxselector.extent([
Expand All @@ -79,12 +116,36 @@ wax.mm.boxselector = function(map, tilejson, opts) {
Math.max(l1.lon, l2.lon))
]);

removeEvent(map.parent, 'mousemove', mouseMove);
removeEvent(map.parent, 'mouseup', mouseUp);
removeEvent(document, 'mousemove', mouseMove);
removeEvent(document, 'mouseup', mouseUp);

map.parent.style.cursor = 'auto';
}

function mouseMoveCursor(e) {
changeCursor(getMousePoint(e), boxDiv);
}

// Set resize cursor if mouse is on edge
function changeCursor(point, elem) {
var TL = {
x: parseInt(boxDiv.offsetLeft),
y: parseInt(boxDiv.offsetTop)
},
BR = {
x: TL.x + parseInt(boxDiv.offsetWidth),
y: TL.y + parseInt(boxDiv.offsetHeight)
};
// Build cursor style string
var prefix = '';
if (point.y - TL.y <= edge) prefix = 'n';
else if (BR.y - point.y <= edge) prefix = 's';
if (point.x - TL.x <= edge) prefix += 'w';
else if (BR.x - point.x <= edge) prefix += 'e';
if (prefix != '') prefix += '-resize';
elem.style.cursor = prefix;
}

function drawbox(map, e) {
if (!boxDiv || !box) return;
var br = map.locationPoint(box[1]),
Expand Down Expand Up @@ -122,15 +183,21 @@ wax.mm.boxselector = function(map, tilejson, opts) {
boxDiv.id = map.parent.id + '-boxselector-box';
boxDiv.className = 'boxselector-box';
map.parent.appendChild(boxDiv);
style = boxDiv.style;
borderWidth = parseInt(window.getComputedStyle(boxDiv).borderWidth);

addEvent(map.parent, 'mousedown', mouseDown);
addEvent(boxDiv, 'mousedown', mouseDownResize);
addEvent(map.parent, 'mousemove', mouseMoveCursor);
map.addCallback('drawn', drawbox);
return this;
};

boxselector.remove = function() {
map.parent.removeChild(boxDiv);
removeEvent(map.parent, 'mousedown', mouseDown);
removeEvent(boxDiv, 'mousedown', mouseDownResize);
removeEvent(map.parent, 'mousemove', mouseMoveCursor);
map.removeCallback('drawn', drawbox);
};

Expand Down