From 23bb46b18fa88ec870ba78cb7f08b296257b4ac5 Mon Sep 17 00:00:00 2001
From: Tulir Asokan <tulir@maunium.net>
Date: Sun, 25 Mar 2018 14:21:59 +0300
Subject: Move room list to custom widget

---
 ui/widget/room-list.go | 128 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 128 insertions(+)
 create mode 100644 ui/widget/room-list.go

(limited to 'ui/widget/room-list.go')

diff --git a/ui/widget/room-list.go b/ui/widget/room-list.go
new file mode 100644
index 0000000..b908510
--- /dev/null
+++ b/ui/widget/room-list.go
@@ -0,0 +1,128 @@
+// gomuks - A terminal Matrix client written in Go.
+// Copyright (C) 2018 Tulir Asokan
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+package widget
+
+import (
+	"github.com/gdamore/tcell"
+	"maunium.net/go/gomuks/matrix/rooms"
+	"maunium.net/go/tview"
+)
+
+type RoomList struct {
+	*tview.Box
+
+	indices  map[*rooms.Room]int
+	items    []*rooms.Room
+	selected *rooms.Room
+
+	// The item main text color.
+	mainTextColor tcell.Color
+	// The text color for selected items.
+	selectedTextColor tcell.Color
+	// The background color for selected items.
+	selectedBackgroundColor tcell.Color
+}
+
+func NewRoomList() *RoomList {
+	return &RoomList{
+		Box:     tview.NewBox(),
+		indices: make(map[*rooms.Room]int),
+		items:   []*rooms.Room{},
+
+		mainTextColor:           tcell.ColorWhite,
+		selectedTextColor:       tcell.ColorWhite,
+		selectedBackgroundColor: tcell.ColorDarkGreen,
+	}
+}
+
+func (list *RoomList) Add(room *rooms.Room) {
+	list.indices[room] = len(list.items)
+	list.items = append(list.items, room)
+	if list.selected == nil {
+		list.selected = room
+	}
+}
+
+func (list *RoomList) Remove(room *rooms.Room) {
+	index, ok := list.indices[room]
+	if !ok {
+		return
+	}
+	delete(list.indices, room)
+	list.items = append(list.items[0:index], list.items[index+1:]...)
+	if len(list.items) == 0 {
+		list.selected = nil
+	}
+}
+
+func (list *RoomList) Clear() {
+	list.indices = make(map[*rooms.Room]int)
+	list.items = []*rooms.Room{}
+	list.selected = nil
+}
+
+func (list *RoomList) SetSelected(room *rooms.Room) {
+	list.selected = room
+}
+
+// Draw draws this primitive onto the screen.
+func (list *RoomList) Draw(screen tcell.Screen) {
+	list.Box.Draw(screen)
+
+	x, y, width, height := list.GetInnerRect()
+	bottomLimit := y + height
+
+	var offset int
+	currentItemIndex, hasSelected := list.indices[list.selected]
+	if hasSelected && currentItemIndex >= height {
+		offset = currentItemIndex + 1 - height
+	}
+
+	// Draw the list items.
+	for index, item := range list.items {
+		if index < offset {
+			continue
+		}
+
+		if y >= bottomLimit {
+			break
+		}
+
+		text := item.GetTitle()
+
+		writeLine(screen, tview.AlignLeft, text, x, y, width, list.mainTextColor)
+
+		// Background color of selected text.
+		if item == list.selected {
+			textWidth := tview.StringWidth(text)
+			for bx := 0; bx < textWidth && bx < width; bx++ {
+				m, c, style, _ := screen.GetContent(x+bx, y)
+				fg, _, _ := style.Decompose()
+				if fg == list.mainTextColor {
+					fg = list.selectedTextColor
+				}
+				style = style.Background(list.selectedBackgroundColor).Foreground(fg)
+				screen.SetContent(x+bx, y, m, c, style)
+			}
+		}
+
+		y++
+		if y >= bottomLimit {
+			break
+		}
+	}
+}
-- 
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