diff options
Diffstat (limited to 'area.go')
| -rw-r--r-- | area.go | 4 |
1 files changed, 3 insertions, 1 deletions
@@ -37,6 +37,8 @@ type Area struct { // (Having to use this interface does not strike me as being particularly Go-like, but the nature of Paint makes channel-based event handling a non-option; in practice, deadlocks occur.) type AreaHandler interface { // Paint is called when the Area needs to be redrawn. + // The part of the Area that needs to be redrawn is stored in cliprect. + // Before Paint() is called, this region is cleared with a system-defined background color. // You MUST handle this event, and you MUST return a valid image, otherwise deadlocks and panicking will occur. // The image returned must have the same size as rect (but does not have to have the same origin points). // Example: @@ -48,7 +50,7 @@ type AreaHandler interface { // func (h *myAreaHandler) Paint(rect image.Rectangle) *image.NRGBA { // return img.SubImage(rect).(*image.NRGBA) // } - Paint(rect image.Rectangle) *image.NRGBA + Paint(cliprect image.Rectangle) *image.NRGBA // Mouse is called when the Area receives a mouse event. // You are allowed to do nothing in this handler (to ignore mouse events). |