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Resize the legend area when traces are hidden #2725

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Merged
shroffk merged 1 commit into from
Mar 13, 2024
Merged

Resize the legend area when traces are hidden #2725

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5 changes: 4 additions & 1 deletion ...ized-plugins/org.csstudio.swt.rtplot/src/org/csstudio/swt/rtplot/internal/LegendPart.java
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Original file line number Diff line number Diff line change
Expand Up @@ -66,22 +66,25 @@ public int getDesiredHeight(final GC gc, final int bounds_width,
final Font orig_font = gc.getFont();
gc.setFont(font);

int items = 0;
int max_width = 1, max_height = 1; // Start with 1 pixel to avoid later div-by-0
for (Trace<XTYPE> trace : traces)
{
if (!trace.isVisible())
continue;
final Point size = gc.textExtent(trace.getLabel());
if (size.x > max_width)
max_width = size.x;
if (size.y > max_height)
max_height = size.y;
items++;
}
// Arrange in grid with some extra space
grid_x = max_width + max_height / 2;
grid_y = max_height;

gc.setFont(orig_font);

final int items = traces.size();
final int items_per_row = Math.max(1, bounds_width / grid_x); // Round down, counting full items
final int rows = (items + items_per_row-1) / items_per_row; // Round up
return rows * grid_y;
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