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authorDrew DeVault <sir@cmpwn.com>2018-02-26 22:54:39 -0500
committerDrew DeVault <sir@cmpwn.com>2018-02-26 22:54:39 -0500
commit1418e1b9dc41d8f69bccb8de0fe0f1fb6835ce11 (patch)
tree4ae8b3373fdadb6dd3e7b8c8789cf938522b8f8a /lib/ui/context.go
parent661e3ec2a4dd97d4a8a8eab4f281b088770a6af2 (diff)
downloadaerc-1418e1b9dc41d8f69bccb8de0fe0f1fb6835ce11.tar.gz
Split UI library and widgets
Diffstat (limited to 'lib/ui/context.go')
-rw-r--r--lib/ui/context.go109
1 files changed, 109 insertions, 0 deletions
diff --git a/lib/ui/context.go b/lib/ui/context.go
new file mode 100644
index 00000000..ca3f4522
--- /dev/null
+++ b/lib/ui/context.go
@@ -0,0 +1,109 @@
+package ui
+
+import (
+ "fmt"
+
+ "github.com/mattn/go-runewidth"
+ tb "github.com/nsf/termbox-go"
+)
+
+// A context allows you to draw in a sub-region of the terminal
+type Context struct {
+ x int
+ y int
+ width int
+ height int
+}
+
+func (ctx *Context) X() int {
+ return ctx.x
+}
+
+func (ctx *Context) Y() int {
+ return ctx.y
+}
+
+func (ctx *Context) Width() int {
+ return ctx.width
+}
+
+func (ctx *Context) Height() int {
+ return ctx.height
+}
+
+func NewContext(width, height int) *Context {
+ return &Context{0, 0, width, height}
+}
+
+func (ctx *Context) Subcontext(x, y, width, height int) *Context {
+ if x+width > ctx.width || y+height > ctx.height {
+ panic(fmt.Errorf("Attempted to create context larger than parent"))
+ }
+ return &Context{
+ x: ctx.x + x,
+ y: ctx.y + y,
+ width: width,
+ height: height,
+ }
+}
+
+func (ctx *Context) SetCell(x, y int, ch rune, fg, bg tb.Attribute) {
+ if x >= ctx.width || y >= ctx.height {
+ panic(fmt.Errorf("Attempted to draw outside of context"))
+ }
+ tb.SetCell(ctx.x+x, ctx.y+y, ch, fg, bg)
+}
+
+func (ctx *Context) Printf(x, y int, ref tb.Cell,
+ format string, a ...interface{}) int {
+
+ if x >= ctx.width || y >= ctx.height {
+ panic(fmt.Errorf("Attempted to draw outside of context"))
+ }
+
+ str := fmt.Sprintf(format, a...)
+
+ x += ctx.x
+ y += ctx.y
+ old_x := x
+
+ newline := func() bool {
+ x = old_x
+ y++
+ return y < ctx.height
+ }
+ for _, ch := range str {
+ if str == " こんにちは " {
+ fmt.Printf("%c\n", ch)
+ }
+ switch ch {
+ case '\n':
+ if !newline() {
+ return runewidth.StringWidth(str)
+ }
+ case '\r':
+ x = old_x
+ default:
+ tb.SetCell(x, y, ch, ref.Fg, ref.Bg)
+ x += runewidth.RuneWidth(ch)
+ if x == old_x+ctx.width {
+ if !newline() {
+ return runewidth.StringWidth(str)
+ }
+ }
+ }
+ }
+
+ return runewidth.StringWidth(str)
+}
+
+func (ctx *Context) Fill(x, y, width, height int, ref tb.Cell) {
+ _x := x
+ _y := y
+ for ; y < _y+height && y < ctx.height; y++ {
+ for ; x < _x+width && x < ctx.width; x++ {
+ ctx.SetCell(x, y, ref.Ch, ref.Fg, ref.Bg)
+ }
+ x = _x
+ }
+}