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/*
* Resize handle for DPF
* Copyright (C) 2021-2022 Filipe Coelho <falktx@falktx.com>
*
* Permission to use, copy, modify, and/or distribute this software for any purpose with
* or without fee is hereby granted, provided that the above copyright notice and this
* permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD
* TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN
* NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
* DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER
* IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#pragma once
#include "NanoVG.hpp"
START_NAMESPACE_DGL
/** Resize handle for DPF windows, will sit on bottom-right. */
class ResizeHandle : public NanoTopLevelWidget
{
public:
/** Overloaded constructor, will fetch the window from an existing top-level widget. */
explicit ResizeHandle(TopLevelWidget* const tlw)
: NanoTopLevelWidget(tlw->getWindow()),
handleSize(16),
hasCursor(false),
isResizing(false)
{
resetArea();
}
/** Set the handle size, minimum 16.
* Scale factor is automatically applied on top of this size as needed */
void setHandleSize(const uint size)
{
handleSize = std::max(16u, size);
resetArea();
}
protected:
void onNanoDisplay() override
{
const double lineWidth = 1.0 * getScaleFactor();
strokeWidth(lineWidth);
// draw white lines, 1px wide
strokeColor(Color(1.0f, 1.0f, 1.0f));
drawLine(l1);
drawLine(l2);
drawLine(l3);
// draw black lines, offset by 1px and 1px wide
strokeColor(Color(0.0f, 0.0f, 0.0f));
Line<double> l1b(l1), l2b(l2), l3b(l3);
l1b.moveBy(lineWidth, lineWidth);
l2b.moveBy(lineWidth, lineWidth);
l3b.moveBy(lineWidth, lineWidth);
drawLine(l1b);
drawLine(l2b);
drawLine(l3b);
}
void drawLine(const Line<double>& line)
{
beginPath();
moveTo(line.getStartPos().getX(), line.getStartPos().getY());
lineTo(line.getEndPos().getX(), line.getEndPos().getY());
stroke();
}
bool onMouse(const MouseEvent& ev) override
{
if (ev.button != 1)
return false;
if (ev.press && area.contains(ev.pos))
{
isResizing = true;
resizingSize = Size<double>(getWidth(), getHeight());
lastResizePoint = ev.pos;
return true;
}
if (isResizing && ! ev.press)
{
isResizing = false;
recheckCursor(ev.pos);
return true;
}
return false;
}
bool onMotion(const MotionEvent& ev) override
{
if (! isResizing)
{
recheckCursor(ev.pos);
return false;
}
const Size<double> offset(ev.pos.getX() - lastResizePoint.getX(),
ev.pos.getY() - lastResizePoint.getY());
resizingSize += offset;
lastResizePoint = ev.pos;
// TODO keepAspectRatio
bool keepAspectRatio;
const Size<uint> minSize(getWindow().getGeometryConstraints(keepAspectRatio));
const uint minWidth = minSize.getWidth();
const uint minHeight = minSize.getHeight();
if (resizingSize.getWidth() < minWidth)
resizingSize.setWidth(minWidth);
if (resizingSize.getWidth() > 16384)
resizingSize.setWidth(16384);
if (resizingSize.getHeight() < minHeight)
resizingSize.setHeight(minHeight);
if (resizingSize.getHeight() > 16384)
resizingSize.setHeight(16384);
setSize(resizingSize.getWidth(), resizingSize.getHeight());
return true;
}
void onResize(const ResizeEvent& ev) override
{
TopLevelWidget::onResize(ev);
resetArea();
}
private:
Rectangle<uint> area;
Line<double> l1, l2, l3;
uint handleSize;
// event handling state
bool hasCursor, isResizing;
Point<double> lastResizePoint;
Size<double> resizingSize;
void recheckCursor(const Point<double>& pos)
{
const bool shouldHaveCursor = area.contains(pos);
if (shouldHaveCursor == hasCursor)
return;
hasCursor = shouldHaveCursor;
setCursor(shouldHaveCursor ? kMouseCursorDiagonal : kMouseCursorArrow);
}
void resetArea()
{
const double scaleFactor = getScaleFactor();
const uint margin = 1.5 * scaleFactor;
const uint size = handleSize * scaleFactor;
area = Rectangle<uint>(getWidth() - size - margin,
getHeight() - size - margin,
size, size);
recreateLines(area.getX(), area.getY(), size);
}
void recreateLines(const uint x, const uint y, const uint size)
{
uint linesize = size;
uint offset = 0;
// 1st line, full diagonal size
l1.setStartPos(x + size, y);
l1.setEndPos(x, y + size);
// 2nd line, bit more to the right and down, cropped
offset += size / 3;
linesize -= size / 3;
l2.setStartPos(x + linesize + offset, y + offset);
l2.setEndPos(x + offset, y + linesize + offset);
// 3rd line, even more right and down
offset += size / 3;
linesize -= size / 3;
l3.setStartPos(x + linesize + offset, y + offset);
l3.setEndPos(x + offset, y + linesize + offset);
}
DISTRHO_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR(ResizeHandle)
};
END_NAMESPACE_DGL
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