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Trim text when the window is too narrow

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This commit is contained in:
Alexander Kojevnikov 2010-05-20 19:31:16 +10:00
parent dc690d0993
commit 5f45726be5
1 changed files with 33 additions and 2 deletions
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35
src/spek-spectrogram.vala
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@ -160,7 +160,7 @@ namespace Spek {
// File properties.
cr.set_font_size (11.0);
cr.move_to (LPAD, TPAD - GAP);
//cr.show_text ("MPEG 1 Audio, Layer 3 (MP3), 320 kbps, 44100 Hz, 2 channels");
//cr.show_text (trim (cr, "MPEG 1 Audio, Layer 3 (MP3), 320 kbps, 44100 Hz, 2 channels", w - LPAD - RPAD, true));
FontExtents ext;
cr.font_extents (out ext);
@ -168,7 +168,7 @@ namespace Spek {
cr.select_font_face ("sans-serif", FontSlant.NORMAL, FontWeight.BOLD);
cr.set_font_size (12.0);
cr.move_to (LPAD, TPAD - 2 * GAP - ext.ascent);
cr.show_text (file_name);
cr.show_text (trim (cr, file_name, w - LPAD - RPAD, false));
}
// Border around the spectrogram.
@ -186,6 +186,37 @@ namespace Spek {
cr.identity_matrix ();
}
// Trim `s` so that it fits into `length`.
private string trim (Context cr, string s, double length, bool end) {
if (length <= 0.0) {
return "";
}
// Check if the entire string fits.
TextExtents ext;
cr.text_extents (s, out ext);
if (ext.width <= length) {
return s;
}
// Binary search FTW!
var fix = "...";
long i = 0;
long k = s.length;
while (k - i > 1) {
var j = (i + k) / 2;
cr.text_extents (end ? s[0:j] + fix : fix + s[j:s.length], out ext);
// TODO: replace with XOR when bgo#619177 is fixed.
if (end && ext.width <= length || !end && ext.width > length) {
i = j;
} else {
k = j;
}
}
return end ? s[0:i] + fix : fix + s[k:s.length];
}
private void put_pixel (ImageSurface surface, int x, int y, uint32 color) {
var i = y * surface.get_stride () + x * 4;
unowned uchar[] data = surface.get_data ();