From 7bbc5b5ed205e54eb962cc8fe81bf23185d1b5a1 Mon Sep 17 00:00:00 2001
From: Qingping Hou <dave2008713@gmail.com>
Date: Mon, 19 Mar 2012 21:22:45 +0800
Subject: [PATCH] highlight with cursor demo

---
 djvureader.lua | 124 ++++++++++++++++++++++++++++++++++++++++++++++---
 reader.lua     |   1 +
 2 files changed, 119 insertions(+), 6 deletions(-)

diff --git a/djvureader.lua b/djvureader.lua
index fed95555d..755727d6a 100644
--- a/djvureader.lua
+++ b/djvureader.lua
@@ -25,6 +25,16 @@ function DJVUReader:_isWordInScreenRange(w)
 				-self.offset_y)
 end
 
+------------------------------------------------
+-- @text text object returned from doc:getPageText()
+-- @l0 start line
+-- @w0 start word
+-- @l1 end line
+-- @w1 end word
+--
+-- get words from the w0th word in l0th line
+-- to w1th word in l1th line (not included).
+------------------------------------------------
 function DJVUReader:_genTextIter(text, l0, w0, l1, w1)
 	local word_items = {}
 	local count = 0
@@ -32,12 +42,21 @@ function DJVUReader:_genTextIter(text, l0, w0, l1, w1)
 	local w = w0
 	local tmp_w1 = 0
 
+	print(l0, w0, l1, w1)
+
+	if l0 < 1 or w0 < 1 or l0 > l1 then
+		return function() return nil end
+	end
+
 	-- build item table
 	while l <= l1 do
 		local words = text[l].words
 
 		if l == l1 then 
-			tmp_w1 = w1 
+			tmp_w1 = w1 - 1
+			if tmp_w1 == 0 then
+				break
+			end
 		else
 			tmp_w1 = #words
 		end
@@ -58,7 +77,7 @@ end
 
 function DJVUReader:_drawTextHighLight(text_iter)
 	for i in text_iter do
-		fb.bb:paintRect(
+		fb.bb:invertRect(
 			i.x0*self.globalzoom,
 			self.offset_y+self.cur_full_height-(i.y1*self.globalzoom),
 			(i.x1-i.x0)*self.globalzoom,
@@ -69,9 +88,102 @@ end
 function DJVUReader:startHighLightMode()
 	local t = self.doc:getPageText(self.pageno)
 
-	--self:_drawTextHighLight(self:_genTextIter(t, 1, 1, #t, #(t[#t].words)))
-	-- highlight the first line
-	self:_drawTextHighLight(self:_genTextIter(t, 1, 1, 1, #(t[1].words)))
-	fb:refresh(0)
+	local function _nextWord(t, cur_l, cur_w) 
+		local new_l = cur_l
+		local new_w = cur_w
+
+		if new_w >= #(t[new_l].words) then
+			-- already the last word, goto next line
+			new_l = new_l + 1
+			if new_l > #t or #(t[new_l].words) == 0 then
+				return cur_l, cur_w
+			end
+			new_w = 1
+		else
+			-- simply move to next word in the same line
+			new_w = new_w + 1
+		end
+
+		return new_l, new_w
+	end
+
+	local function _prevWord(t, cur_l, cur_w)
+		local new_l = cur_l
+		local new_w = cur_w
+
+		if new_w == 1 then
+			-- already the first word, goto previous line
+			new_l = new_l - 1
+			if new_l == 0 or #(t[new_l].words) == 0 then
+				return cur_l, cur_w
+			end
+			new_w = #(t[new_l].words) + 1
+		else
+			-- simply move to previous word in the same line
+			new_w = new_w - 1
+		end
+
+		return new_l, new_w
+	end
+
+	local function _nextLine(t, cur_l, cur_w)
+		local new_l = cur_l
+		local new_w = cur_w
+
+		if new_l >= #t then
+			return cur_l, cur_w
+		end
+
+		new_l = new_l + 1
+		new_w = math.min(new_w, #t[new_l].words+1)
+
+		return new_l, new_w
+	end
+
+	local function _prevLine(t, cur_l, cur_w)
+		local new_l = cur_l
+		local new_w = cur_w
+
+		if new_l == 1 then
+			return cur_l, cur_w
+		end
+
+		new_l = new_l - 1
+		new_w = math.min(new_w, #t[new_l].words+1)
+
+		return new_l, new_w
+	end
+
+
+	-- next to be marked word position
+	local cur_l = 1
+	--local cur_w = #(t[1].words)
+	local cur_w = 1
+	local new_l = 1
+	local new_w = 1
+	local iter
+
+	while true do
+		local ev = input.waitForEvent()
+		ev.code = adjustKeyEvents(ev)
+		if ev.type == EV_KEY and ev.value == EVENT_VALUE_KEY_PRESS then
+			if ev.code == KEY_FW_RIGHT then
+				new_l, new_w = _nextWord(t, cur_l, cur_w)
+				iter = self:_genTextIter(t, cur_l, cur_w, new_l, new_w)
+			elseif ev.code == KEY_FW_LEFT then
+				new_l, new_w = _prevWord(t, cur_l, cur_w)
+				iter = self:_genTextIter(t, new_l, new_w, cur_l, cur_w)
+			elseif ev.code == KEY_FW_DOWN then
+				new_l, new_w = _nextLine(t, cur_l, cur_w)
+				iter = self:_genTextIter(t, cur_l, cur_w, new_l, new_w)
+			elseif ev.code == KEY_FW_UP then
+				new_l, new_w = _prevLine(t, cur_l, cur_w)
+				iter = self:_genTextIter(t, new_l, new_w, cur_l, cur_w)
+			end
+			self:_drawTextHighLight(iter)
+			fb:refresh(0)
+			cur_l, cur_w = new_l, new_w
+		end
+	end
 end
 
diff --git a/reader.lua b/reader.lua
index 9c18d3cee..4b582d9f9 100755
--- a/reader.lua
+++ b/reader.lua
@@ -140,6 +140,7 @@ if ARGV[optind] and lfs.attributes(ARGV[optind], "mode") == "directory" then
 		else
 			if file ~= nil then
 				running = openFile(file)
+				print(file)
 			else
 				running = false
 			end