1/*
2 src/imagepanel.cpp -- Image panel widget which shows a number of
3 square-shaped icons
4
5 NanoGUI was developed by Wenzel Jakob <wenzel.jakob@epfl.ch>.
6 The widget drawing code is based on the NanoVG demo application
7 by Mikko Mononen.
8
9 All rights reserved. Use of this source code is governed by a
10 BSD-style license that can be found in the LICENSE.txt file.
11*/
12
13#include <nanogui/imagepanel.h>
14#include <nanogui/opengl.h>
15
16NAMESPACE_BEGIN(nanogui)
17
18ImagePanel::ImagePanel(Widget *parent)
19 : Widget(parent), mThumbSize(64), mSpacing(10), mMargin(10),
20 mMouseIndex(-1) {}
21
22Vector2i ImagePanel::gridSize() const {
23 int nCols = 1 + std::max(0,
24 (int) ((mSize.x() - 2 * mMargin - mThumbSize) /
25 (float) (mThumbSize + mSpacing)));
26 int nRows = ((int) mImages.size() + nCols - 1) / nCols;
27 return Vector2i(nCols, nRows);
28}
29
30int ImagePanel::indexForPosition(const Vector2i &p) const {
31 Vector2f pp = ((p - mPos).cast<float>() - Vector2f::Constant(mMargin)) /
32 (float)(mThumbSize + mSpacing);
33 float iconRegion = mThumbSize / (float)(mThumbSize + mSpacing);
34 bool overImage = pp.x() - std::floor(pp.x()) < iconRegion &&
35 pp.y() - std::floor(pp.y()) < iconRegion;
36 Vector2i gridPos = pp.cast<int>(), grid = gridSize();
37 overImage &= ((gridPos.array() >= 0).all() &&
38 (gridPos.array() < grid.array()).all());
39 return overImage ? (gridPos.x() + gridPos.y() * grid.x()) : -1;
40}
41
42bool ImagePanel::mouseMotionEvent(const Vector2i &p, const Vector2i & /* rel */,
43 int /* button */, int /* modifiers */) {
44 mMouseIndex = indexForPosition(p);
45 return true;
46}
47
48bool ImagePanel::mouseButtonEvent(const Vector2i &p, int /* button */, bool down,
49 int /* modifiers */) {
50 int index = indexForPosition(p);
51 if (index >= 0 && index < (int) mImages.size() && mCallback && down)
52 mCallback(index);
53 return true;
54}
55
56Vector2i ImagePanel::preferredSize(NVGcontext *) const {
57 Vector2i grid = gridSize();
58 return Vector2i(
59 grid.x() * mThumbSize + (grid.x() - 1) * mSpacing + 2*mMargin,
60 grid.y() * mThumbSize + (grid.y() - 1) * mSpacing + 2*mMargin
61 );
62}
63
64void ImagePanel::draw(NVGcontext* ctx) {
65 Vector2i grid = gridSize();
66
67 for (size_t i=0; i<mImages.size(); ++i) {
68 Vector2i p = mPos + Vector2i::Constant(mMargin) +
69 Vector2i((int) i % grid.x(), (int) i / grid.x()) * (mThumbSize + mSpacing);
70 int imgw, imgh;
71
72 nvgImageSize(ctx, mImages[i].first, &imgw, &imgh);
73 float iw, ih, ix, iy;
74 if (imgw < imgh) {
75 iw = mThumbSize;
76 ih = iw * (float)imgh / (float)imgw;
77 ix = 0;
78 iy = -(ih - mThumbSize) * 0.5f;
79 } else {
80 ih = mThumbSize;
81 iw = ih * (float)imgw / (float)imgh;
82 ix = -(iw - mThumbSize) * 0.5f;
83 iy = 0;
84 }
85
86 NVGpaint imgPaint = nvgImagePattern(
87 ctx, p.x() + ix, p.y()+ iy, iw, ih, 0, mImages[i].first,
88 mMouseIndex == (int)i ? 1.0 : 0.7);
89
90 nvgBeginPath(ctx);
91 nvgRoundedRect(ctx, p.x(), p.y(), mThumbSize, mThumbSize, 5);
92 nvgFillPaint(ctx, imgPaint);
93 nvgFill(ctx);
94
95 NVGpaint shadowPaint =
96 nvgBoxGradient(ctx, p.x() - 1, p.y(), mThumbSize + 2, mThumbSize + 2, 5, 3,
97 nvgRGBA(0, 0, 0, 128), nvgRGBA(0, 0, 0, 0));
98 nvgBeginPath(ctx);
99 nvgRect(ctx, p.x()-5,p.y()-5, mThumbSize+10,mThumbSize+10);
100 nvgRoundedRect(ctx, p.x(),p.y(), mThumbSize,mThumbSize, 6);
101 nvgPathWinding(ctx, NVG_HOLE);
102 nvgFillPaint(ctx, shadowPaint);
103 nvgFill(ctx);
104
105 nvgBeginPath(ctx);
106 nvgRoundedRect(ctx, p.x()+0.5f,p.y()+0.5f, mThumbSize-1,mThumbSize-1, 4-0.5f);
107 nvgStrokeWidth(ctx, 1.0f);
108 nvgStrokeColor(ctx, nvgRGBA(255,255,255,80));
109 nvgStroke(ctx);
110 }
111}
112
113NAMESPACE_END(nanogui)
114