1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
|
//
// Clipboard display test application for the Fast Light Tool Kit (FLTK).
//
// Copyright 1998-2021 by Bill Spitzak and others.
//
// This library is free software. Distribution and use rights are outlined in
// the file "COPYING" which should have been included with this file. If this
// file is missing or damaged, see the license at:
//
// https://www.fltk.org/COPYING.php
//
// Please see the following page on how to report bugs and issues:
//
// https://www.fltk.org/bugs.php
//
#include <FL/Fl.H>
#include <FL/Fl_Window.H>
#include <FL/Fl_Box.H>
#include <FL/Fl_PNG_Image.H>
#include <FL/Fl_Shared_Image.H>
#include <FL/Fl_Text_Display.H>
#include <FL/Fl_Tabs.H>
#include <FL/Fl_Button.H>
#include <FL/Fl_Native_File_Chooser.H>
#include <FL/fl_draw.H>
#include <FL/fl_ask.H>
#include <stdio.h>
// optional: display extra technical info about clipboard content if defined
// #define DEBUG_CLIPBOARD_DATA
#if defined(_WIN32) && defined(DEBUG_CLIPBOARD_DATA)
#include <windows.h>
#endif // _WIN32 && DEBUG_CLIPBOARD_DATA
/* Displays and follows the content of the clipboard with either image or text data
*/
Fl_Box *image_box;
Fl_Box *image_size;
Fl_Text_Display *display;
Fl_RGB_Image *cl_img = 0; // image from clipboard
inline int fl_min(int a, int b) {
return (a < b ? a : b);
}
// a box with a chess-like pattern below its image
class chess : public Fl_Box {
public:
chess(int x, int y, int w, int h)
: Fl_Box(FL_FLAT_BOX, x, y, w, h, 0) {
align(FL_ALIGN_CENTER | FL_ALIGN_CLIP);
}
void draw() FL_OVERRIDE {
draw_box();
Fl_Image *img = image();
if (img) { // draw the chess pattern below the box centered image
int X = x() + (w() - img->w()) / 2;
int Y = y() + (h() - img->h()) / 2;
int W = img->w();
int H = img->h();
fl_push_clip(X, Y, W, H);
fl_push_clip(x(), y(), w(), h());
fl_color(FL_WHITE);
fl_rectf(X, Y, W, H);
fl_color(FL_LIGHT2);
const int side = 4, side2 = 2 * side;
for (int j = Y; j < Y + H; j += side) {
for (int i = X + (j - Y) % side2; i < X + W; i += side2) {
fl_rectf(i, j, side, side);
}
}
fl_pop_clip();
fl_pop_clip();
}
draw_label(); // draw the box image
}
};
#define TAB_COLOR FL_DARK3
// use tabs to display either the image or textual content of the clipboard
class clipboard_viewer : public Fl_Tabs {
public:
clipboard_viewer(int x, int y, int w, int h)
: Fl_Tabs(x, y, w, h) {}
int handle(int event) FL_OVERRIDE {
if (event != FL_PASTE)
return Fl_Tabs::handle(event);
if (strcmp(Fl::event_clipboard_type(), Fl::clipboard_image) == 0) { // an image is being pasted
cl_img = (Fl_RGB_Image *)Fl::event_clipboard(); // get it as an Fl_RGB_Image object
if (!cl_img)
return 1;
char title[300];
snprintf(title, 300, "%dx%d", cl_img->w(), cl_img->h()); // display the image original size
// optional: display extra technical info about clipboard content
#if defined(_WIN32) && defined(DEBUG_CLIPBOARD_DATA)
OpenClipboard(NULL); //
char *p = title + strlen(title);
int format = EnumClipboardFormats(0);
if (format && format < CF_MAX) {
snprintf(p, sizeof(title) - strlen(title), " %d", format);
p += strlen(p);
}
while (format) {
format = EnumClipboardFormats(format);
if (format && format < CF_MAX) {
snprintf(p, sizeof(title) - strlen(title), " %d", format);
p += strlen(p);
}
}
HANDLE h;
if ((h = GetClipboardData(CF_DIB))) {
LPBITMAPINFO lpBI = (LPBITMAPINFO)GlobalLock(h);
snprintf(p, sizeof(title) - strlen(title), " biBitCount=%d biCompression=%d biClrUsed=%d",
lpBI->bmiHeader.biBitCount,
(int)lpBI->bmiHeader.biCompression,
(int)lpBI->bmiHeader.biClrUsed);
}
CloseClipboard();
#endif // _WIN32 && DEBUG_CLIPBOARD_DATA
Fl_Image *oldimg = image_box->image();
delete oldimg;
if (cl_img->w() > image_box->w() || cl_img->h() > image_box->h())
cl_img->scale(image_box->w(), image_box->h());
image_box->image(cl_img); // show the scaled image
image_size->copy_label(title);
value(image_box->parent());
window()->redraw();
} else { // text is being pasted
display->buffer()->text(Fl::event_text());
value(display);
display->redraw();
}
return 1;
}
};
clipboard_viewer *tabs;
// clipboard viewer callback
void cb(Fl_Widget *wid, clipboard_viewer *tabs) {
if (Fl::clipboard_contains(Fl::clipboard_image)) {
Fl::paste(*tabs, 1, Fl::clipboard_image); // try to find image in the clipboard
return;
}
if (Fl::clipboard_contains(Fl::clipboard_plain_text))
Fl::paste(*tabs, 1, Fl::clipboard_plain_text); // also try to find text
}
// "Save PNG" callback
void save_cb(Fl_Widget *wid, clipboard_viewer *tabs) {
if (cl_img && !cl_img->fail()) {
Fl_Native_File_Chooser fnfc;
fnfc.title("Please select a .png file");
fnfc.type(Fl_Native_File_Chooser::BROWSE_SAVE_FILE);
fnfc.filter("PNG\t*.png\n");
fnfc.options(Fl_Native_File_Chooser::SAVEAS_CONFIRM | Fl_Native_File_Chooser::USE_FILTER_EXT);
if (fnfc.show())
return;
const char *filename = fnfc.filename();
if (filename)
fl_write_png(filename, cl_img);
} else {
fl_message("%s", "No image available");
}
}
// called after clipboard was changed or at application activation
void clip_callback(int source, void *data) {
if (source == 1)
cb(NULL, (clipboard_viewer *)data);
}
int main(int argc, char **argv) {
fl_register_images(); // required for the X11 platform to allow pasting of images
Fl_Window *win = new Fl_Window(500, 550, "FLTK Clipboard Viewer");
tabs = new clipboard_viewer(0, 0, 500, 500);
Fl_Group *g = new Fl_Group(5, 30, 490, 460, Fl::clipboard_image); // will display the image form
g->box(FL_FLAT_BOX);
image_box = new chess(5, 30, 490, 450);
image_size = new Fl_Box(FL_NO_BOX, 5, 485, 490, 10, 0);
g->end();
g->selection_color(TAB_COLOR);
Fl_Text_Buffer *buffer = new Fl_Text_Buffer();
display = new Fl_Text_Display(5, 30, 490, 460, Fl::clipboard_plain_text); // will display the text form
display->buffer(buffer);
display->selection_color(TAB_COLOR);
display->textfont(FL_COURIER); // use fixed font for text display
tabs->end();
tabs->resizable(display);
Fl_Group *g2 = new Fl_Group(10, 510, 330, 25);
Fl_Button *refresh = new Fl_Button(10, 510, 200, 25, "Refresh from clipboard");
refresh->callback((Fl_Callback *)cb, tabs);
Fl_Button *save = new Fl_Button(220, 510, 100, 25, "Save PNG");
save->callback((Fl_Callback *)save_cb, tabs);
g2->end();
g2->resizable(NULL);
win->end();
win->resizable(tabs);
win->show(argc, argv);
// TEST: set another default background color
#if (0)
if (argc < 2) {
Fl::set_color(FL_BACKGROUND_COLOR, 0xff, 0xee, 0xdd);
Fl::set_color(FL_BACKGROUND2_COLOR, 0xdd, 0xee, 0xff);
}
#endif
clip_callback(1, tabs); // use clipboard content at start
Fl::add_clipboard_notify(clip_callback, tabs); // will update with new clipboard content
Fl_Image::RGB_scaling(FL_RGB_SCALING_BILINEAR); // set bilinear image scaling method
return Fl::run();
}
|
