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TODO reduction and documentation fixups in Grid.

This commit is contained in:
Pietro Gagliardi 2014-03-11 12:01:25 -04:00
parent ee80429bb9
commit 28bd1e9990
1 changed files with 16 additions and 8 deletions
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24
grid.go
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@ -15,7 +15,7 @@ import (
// A stretchy Control implicitly fills its cell.
// All cooridnates in a Grid are given in (row,column) form with (0,0) being the top-left cell.
// Unlike other UI toolkit Grids, this Grid does not (yet? TODO) allow Controls to span multiple rows or columns.
// TODO differnet row/column control alignment; stretchy controls or other resizing options
// TODO differnet row/column control alignment
type Grid struct {
lock sync.Mutex
created bool
@ -66,29 +66,36 @@ func NewGrid(nPerRow int, controls ...Control) *Grid {
}
}
// SetFilling sets the given Control of the Grid as filling its cell instead of staying at its preferred size.
// SetFilling marks the given Control of the Grid as filling its cell instead of staying at its preferred size.
// This function cannot be called after the Window that contains the Grid has been created.
// (TODO action if coorindate invalid)
// It panics if the given coordinate is invalid.
func (g *Grid) SetFilling(row int, column int) {
g.lock.Lock()
defer g.lock.Unlock()
if g.created {
panic("Grid.SetFilling() called after window create") // TODO
panic(fmt.Errorf("Grid.SetFilling() called after window create"))
}
if row < 0 || column < 0 || row > len(g,filling) || column > len(g.filling[row]) {
panic(fmt.Errorf("coordinate (%d,%d) out of range passed to Grid.SetFilling()", row, column)
}
g.filling[row][column] = true
}
// SetStretchy sets the given Control of the Grid as stretchy.
// SetStretchy marks the given Control of the Grid as stretchy.
// Stretchy implies filling.
// Only one control can be stretchy per Grid; calling SetStretchy multiple times merely changes which control is stretchy.
// This function cannot be called after the Window that contains the Grid has been created.
// (TODO action if coorindate invalid)
// It panics if the given coordinate is invalid.
func (g *Grid) SetStretchy(row int, column int) {
g.lock.Lock()
defer g.lock.Unlock()
if g.created {
panic("Grid.SetFilling() called after window create") // TODO
panic(fmt.Errorf("Grid.SetFilling() called after window create"))
}
if row < 0 || column < 0 || row > len(g,filling) || column > len(g.filling[row]) {
panic(fmt.Errorf("coordinate (%d,%d) out of range passed to Grid.SetStretchy()", row, column)
}
g.stretchyrow = row
g.stretchycol = column
@ -140,7 +147,7 @@ func (g *Grid) setRect(x int, y int, width int, height int, winheight int) error
}
}
// 3) handle the stretchy control
if g.stretchyrow != -1 && g.stretchycol != -1 { // TODO internal error if one is -1 but not both
if g.stretchyrow != -1 && g.stretchycol != -1 {
for i, w := range g.colwidths {
if i != g.stretchycol {
width -= w
@ -154,6 +161,7 @@ func (g *Grid) setRect(x int, y int, width int, height int, winheight int) error
g.colwidths[g.stretchycol] = width
g.rowheights[g.stretchyrow] = height
}
// TODO add a sanity check for g.stretchyrow xor g.stretchycol == -1?
// 4) draw
startx := x
for row, xcol := range g.controls {