Really figuring some things out

layout_flags.go

@@ -0,0 +1,59 @@
+/*
+Copyright © Brian Buller <brian@bullercodeworks.com>
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
+*/
+package widgets
+
+type LayoutFlag int
+
+// Alignment Flags
+// The default should be fully centered
+const (
+	_              = LayoutFlag(iota)
+	LFAlignHLeft   // 01
+	LFAlignHRight  // 10
+	LFAlignHCenter // 11
+
+	LFAlignH = LayoutFlag(0x11)
+)
+
+const (
+	_              = LayoutFlag(iota << 2)
+	LFAlignVTop    // 0100
+	LFAlignVBottom // 1000
+	LFAlignVCenter // 1100
+
+	LFAlignV = LayoutFlag(0x1100)
+)
+
+func (f LayoutFlag) Add(fl LayoutFlag)  { f |= fl }
+func (f LayoutFlag) AlignH() LayoutFlag { return f & LFAlignH }
+func (f LayoutFlag) AlignV() LayoutFlag { return f & LFAlignV }
+func (f LayoutFlag) IsAlignH() bool     { return f.AlignH() > 0 }
+func (f LayoutFlag) IsAlignV() bool     { return f.AlignV() > 0 }
+func (f LayoutFlag) ClearAlignH() {
+	f = f &^ LFAlignH
+	f.Add(LFAlignHCenter)
+}
+
+func (f LayoutFlag) ClearAlignV() {
+	f = f &^ LFAlignV
+	f.Add(LFAlignVCenter)
+}