Mercurial > hg > indyvon
view src/net/kryshen/indyvon/layers.clj @ 60:7e456697924d
Asynchronous drawing (continue).
| author | Mikhail Kryshen <mikhail@kryshen.net> |
|---|---|
| date | Mon, 23 Aug 2010 21:24:33 +0400 |
| parents | b68de6a43f29 |
| children | 88bb47e3a401 |
line source
1 ;;
2 ;; Copyright (C) 2010 Mikhail Kryshen <mikhail@kryshen.net>
3 ;;
4 ;; This file is part of Indyvon.
5 ;;
7 (ns net.kryshen.indyvon.layers
8 "Implementations of Layer protocol."
9 (:use
10 net.kryshen.indyvon.core)
11 (:import
12 (net.kryshen.indyvon.core Size Location)
13 (java.lang.ref SoftReference)
14 (java.awt Font Cursor Image Toolkit)
15 (java.awt.image ImageObserver BufferedImage)
16 (java.awt.font FontRenderContext TextLayout)
17 (java.util.concurrent ThreadPoolExecutor
18 ThreadPoolExecutor$DiscardOldestPolicy
19 ArrayBlockingQueue TimeUnit)))
21 ;; Define as macro to avoid unnecessary calculation of inner and outer
22 ;; sizes in the first case.
23 (defmacro align-xy [inner outer align first center last]
24 `(case ~align
25 ~first 0
26 ~center (/ (- ~outer ~inner) 2)
27 ~last (- ~outer ~inner)))
29 (defmacro align-x [inner outer align]
30 `(align-xy ~inner ~outer ~align :left :center :right))
32 (defmacro align-y [inner outer align]
33 `(align-xy ~inner ~outer ~align :top :center :bottom))
35 (defmacro decorate-layer
36 "Decorate Layer and Anchored replacing render! implementation."
37 [layer & render-tail]
38 `(reify
39 Layer
40 (render! ~@render-tail)
41 (layer-size [t#] (layer-size ~layer))
42 Anchored
43 (anchor [t# xa# ya#] (anchor ~layer xa# ya#))))
45 (defn padding
46 "Decorates layer adding padding."
47 ([content pad]
48 (padding content pad pad pad pad))
49 ([content top left bottom right]
50 (if (== 0 top left bottom right)
51 content
52 (reify
53 Layer
54 (render! [l]
55 (draw! content
56 left top
57 (- *width* left right)
58 (- *height* top bottom)))
59 (layer-size [l]
60 (let [s (layer-size content)]
61 (Size. (+ (:width s) left right)
62 (+ (:height s) top bottom))))))))
64 (defn border
65 "Decorate layer with a border."
66 ([content]
67 (border content 1))
68 ([content width]
69 (border content width 0))
70 ([content width gap]
71 (let [layer (padding content (+ width gap))]
72 (decorate-layer layer [_]
73 (with-color (:border-color *theme*)
74 (doseq [i (range 0 width)]
75 (.drawRect *graphics* i i
76 (- *width* 1 i i)
77 (- *height* 1 i i))))
78 (render! layer)))))
80 (defn panel
81 "Opaque layer using theme's alt-back-color."
82 ([content]
83 (panel content 0))
84 ([content gap]
85 (let [layer (padding content gap)]
86 (decorate-layer layer [_]
87 (with-color (:alt-back-color *theme*)
88 (.fillRect *graphics* 0 0 *width* *height*))
89 (render! layer)))))
91 (defn- re-split [^java.util.regex.Pattern re s]
92 (seq (.split re s)))
94 (def text-layout-cache (atom {}))
96 (defn- get-text-layout
97 [^String line ^Font font ^FontRenderContext font-context]
98 (let [key [line font font-context]]
99 (or (if-let [^SoftReference softref (@text-layout-cache key)]
100 (.get softref)
101 (do (swap! text-layout-cache dissoc key)
102 false))
103 (let [layout (TextLayout. line font font-context)]
104 ;;(println "text-layout-cache miss" line)
105 (swap! text-layout-cache assoc key (SoftReference. layout))
106 layout))))
108 (defn- layout-text
109 [lines ^Font font ^FontRenderContext font-context]
110 (map #(get-text-layout % font font-context) lines))
111 ;;(map #(TextLayout. ^String % font font-context) lines))
113 (defn- text-width [layouts]
114 (reduce (fn [w ^TextLayout tl] (max w (.getAdvance tl))) 0 layouts))
116 (defn- text-height [layouts]
117 (reduce (fn [w ^TextLayout tl] (+ w (.getAscent tl)
118 (.getDescent tl)
119 (.getLeading tl)))
120 0 layouts))
122 (defn text-layer
123 "Creates a layer to display multiline text."
124 ([text]
125 (text-layer text :left :top))
126 ([text h-align v-align]
127 (let [lines (re-split #"\r\n|\n|\r|\u0085|\u2028|\u2029" text)]
128 (reify Layer
129 (render! [layer]
130 (let [w *width*
131 h *height*
132 font (.getFont *graphics*)
133 layouts (layout-text lines font *font-context*)
134 y (align-y (text-height layouts) h v-align)]
135 (loop [layouts layouts, y y]
136 (when-first [^TextLayout layout layouts]
137 (let [ascent (.getAscent layout)
138 lh (+ ascent (.getDescent layout) (.getLeading layout))
139 x (align-x (.getAdvance layout) w h-align)]
140 (.draw layout *graphics* x (+ y ascent))
141 (recur (next layouts) (+ y lh)))))))
142 (layer-size [layer]
143 (let [layouts (layout-text lines (:font *theme*) *font-context*)
144 width (text-width layouts)
145 height (text-height layouts)]
146 (Size. width height)))))))
148 (defn- ^ImageObserver image-observer [update-fn]
149 (reify
150 ImageObserver
151 (imageUpdate [this img infoflags x y width height]
152 (update-fn)
153 (zero? (bit-and infoflags
154 (bit-or ImageObserver/ALLBITS
155 ImageObserver/ABORT))))))
157 (defn image-layer
158 [image-or-uri]
159 (let [^Image image (if (isa? image-or-uri Image)
160 image-or-uri
161 (.getImage (Toolkit/getDefaultToolkit)
162 ^java.net.URL image-or-uri))]
163 (.prepareImage (Toolkit/getDefaultToolkit) image -1 -1 nil)
164 (reify
165 Layer
166 (render! [layer]
167 (.drawImage *graphics* image 0 0 (image-observer *update*)))
168 (layer-size [layer]
169 (let [observer (image-observer *update*)
170 width (.getWidth image observer)
171 height (.getHeight image observer)
172 width (if (pos? width) width 1)
173 height (if (pos? height) height 1)]
174 (Size. width height))))))
176 (defn async-layer
177 "Creates layer that draws the content asynchroniously in an
178 offscreen buffer."
179 [content width height]
180 ;; TODO: dynamic size.
181 (let [executor (ThreadPoolExecutor. 1 1 0 TimeUnit/SECONDS
182 (ArrayBlockingQueue. 1)
183 (ThreadPoolExecutor$DiscardOldestPolicy.))
184 buffers (ref [nil nil])
185 updated (ref false)
186 create-buffer
187 #(BufferedImage. width height BufferedImage/TYPE_INT_ARGB)
188 draw-offscreen
189 (fn draw-offscreen []
190 (let [b (dosync (let [b (peek @buffers)]
191 (alter buffers pop)
192 b))]
193 ;; TODO: use operational event dispatcher.
194 (context-draw! (.getGraphics b)
195 dummy-event-dispatcher
196 #(.execute executor draw-offscreen)
197 width height)
198 (dosync
199 (alter buffers conj b)
200 (ref-set updated true))))]
201 (reify
202 Layer
203 (render! [layer]
204 (let [buffer (dosync
205 (if @updated
206 (do (peek @buffers)
207 (alter buffers pop)
208 (ref-set updated false))
209 (do (first @buffers)
210 (alter buffers next))))]
211 (when buffer
212 (.drawImage *graphics* buffer))
213 (let [new-buffer (or buffer (create-buffer))]
214 (dosync
215 (alter buffers #(cons new-buffer %)))
216 (when (not buffer)
217 ;; No cached image to draw.
218 ;; TODO: draw immediately.
219 (.execute executor draw-offscreen)))))
220 (layer-size [layer]
221 (Size. width height)))))
223 (defn viewport
224 "Creates scrollable viewport layer."
225 ([content] (viewport content :left :top))
226 ([content h-align v-align]
227 (let [x (ref 0)
228 y (ref 0)
229 fix-x (ref 0)
230 fix-y (ref 0)
231 last-width (ref 0)
232 last-height (ref 0)]
233 (reify
234 Layer
235 (render! [layer]
236 (with-handlers layer
237 (let [anchor (anchor content h-align v-align)]
238 (dosync
239 (alter x + (align-x *width* @last-width h-align))
240 (alter y + (align-y *height* @last-height v-align))
241 (ref-set last-width *width*)
242 (ref-set last-height *height*))
243 (draw! content (- 0 @x (:x anchor)) (- 0 @y (:y anchor))))
244 (:mouse-pressed e
245 (dosync
246 (ref-set fix-x (:x-on-screen e))
247 (ref-set fix-y (:y-on-screen e)))
248 (->> Cursor/MOVE_CURSOR Cursor. (.setCursor *target*)))
249 (:mouse-released e
250 (->> Cursor/DEFAULT_CURSOR Cursor. (.setCursor *target*)))
251 (:mouse-dragged e
252 (dosync
253 (alter x + (- @fix-x (:x-on-screen e)))
254 (alter y + (- @fix-y (:y-on-screen e)))
255 (ref-set fix-x (:x-on-screen e))
256 (ref-set fix-y (:y-on-screen e)))
257 (*update*))))
258 (layer-size [layer] (layer-size content))))))
260 ;;
261 ;; Layer context decorators.
262 ;;
264 (defmacro handler [layer & handlers]
265 "Decorate layer to handle events."
266 `(let [layer# ~layer]
267 (decorate-layer layer# [t#]
268 (with-handlers t#
269 (render! layer#)
270 ~@handlers))))
272 (defn theme [layer & map-or-keyvals]
273 (let [theme (if (== (count map-or-keyvals) 1)
274 map-or-keyvals
275 (apply array-map map-or-keyvals))]
276 (reify
277 Layer
278 (render! [t]
279 (with-theme theme
280 (render! layer)))
281 (layer-size [t]
282 (with-theme theme
283 (layer-size layer)))
284 Anchored
285 (anchor [t xa ya]
286 (with-theme theme
287 (anchor layer xa ya))))))