feat(example) add lv example list 2 (#2545)

* added micropython sample for obj.move_to_index(index) * formatting update * added lv.group_remove_obj(btn) for command buttons * updated CHANGELOG.md
2021-09-13 17:41:25 +02:00
parent f810265c0d
commit 953d9fb003
2 changed files with 139 additions and 0 deletions
--- a/examples/widgets/list/lv_example_list_2.py
+++ b/examples/widgets/list/lv_example_list_2.py
@@ -0,0 +1,137 @@
+import urandom
+
+currentButton = None
+list1 = None
+
+def event_handler(evt):
+    global currentButton
+    code = evt.get_code()
+    obj = evt.get_target()
+    if code == lv.EVENT.CLICKED:
+        if currentButton == obj:
+            currentButton = None
+        else:
+            currentButton = obj
+        parent = obj.get_parent()
+        for i in range( parent.get_child_cnt()):
+            child = parent.get_child(i)
+            if child == currentButton:
+                child.add_state(lv.STATE.CHECKED)
+            else:
+                child.clear_state(lv.STATE.CHECKED)
+
+def event_handler_top(evt):
+    global currentButton
+    code = evt.get_code()
+    obj = evt.get_target()
+    if code == lv.EVENT.CLICKED:
+        if currentButton == None:
+            return
+        currentButton.move_background()
+        currentButton.scroll_to_view( lv.ANIM.ON)
+
+def event_handler_up(evt):
+    global currentButton
+    code = evt.get_code()
+    obj = evt.get_target()
+    if code == lv.EVENT.CLICKED or code == lv.EVENT.LONG_PRESSED_REPEAT:
+        if currentButton == None:
+            return
+        index = currentButton.get_index()
+        if index <= 0:
+            return
+        currentButton.move_to_index(index - 1)
+        currentButton.scroll_to_view(lv.ANIM.ON)
+
+def event_handler_center(evt):
+    global currentButton
+    code = evt.get_code()
+    obj = evt.get_target()
+    if code == lv.EVENT.CLICKED or code == lv.EVENT.LONG_PRESSED_REPEAT:
+        if currentButton == None:
+            return
+        parent = currentButton.get_parent()
+        pos = parent.get_child_cnt() // 2
+        currentButton.move_to_index(pos)
+        currentButton.scroll_to_view(lv.ANIM.ON)
+
+def event_handler_dn(evt):
+    global currentButton
+    code = evt.get_code()
+    obj = evt.get_target()
+    if code == lv.EVENT.CLICKED or code == lv.EVENT.LONG_PRESSED_REPEAT:
+        if currentButton == None:
+            return
+        index = currentButton.get_index()
+        currentButton.move_to_index(index + 1)
+        currentButton.scroll_to_view(lv.ANIM.ON)
+
+def event_handler_bottom(evt):
+    global currentButton
+    code = evt.get_code()
+    obj = evt.get_target()
+    if code == lv.EVENT.CLICKED or code == lv.EVENT.LONG_PRESSED_REPEAT:
+        if currentButton == None:
+            return
+        currentButton.move_foreground()
+        currentButton.scroll_to_view(lv.ANIM.ON)
+
+def event_handler_swap(evt):
+    global currentButton
+    global list1
+    code = evt.get_code()
+    obj = evt.get_target()
+    if code == lv.EVENT.CLICKED:    
+        cnt = list1.get_child_cnt()
+        for i in range(100):
+            if cnt > 1:
+                obj = list1.get_child(urandom.getrandbits(32) % cnt )
+                obj.move_to_index(urandom.getrandbits(32) % cnt)
+        if currentButton != None:
+            currentButton.scroll_to_view(lv.ANIM.ON)
+                
+#Create a list with buttons that can be sorted
+list1 = lv.list(lv.scr_act())
+list1.set_size(lv.pct(60), lv.pct(100))
+list1.set_style_pad_row( 5, 0)
+
+for i in range(15):
+    btn = lv.btn(list1)
+    btn.set_width(lv.pct(100))
+    btn.add_event_cb( event_handler, lv.EVENT.CLICKED, None)
+    lab = lv.label(btn)
+    lab.set_text("Item " + str(i))
+
+#Select the first button by default
+currentButton = list1.get_child(0)
+currentButton.add_state(lv.STATE.CHECKED)
+
+#Create a second list with up and down buttons
+list2 = lv.list(lv.scr_act())
+list2.set_size(lv.pct(40), lv.pct(100))
+list2.align(lv.ALIGN.TOP_RIGHT, 0, 0)
+list2.set_flex_flow(lv.FLEX_FLOW.COLUMN)
+
+btn = list2.add_btn(None, "Top")
+btn.add_event_cb(event_handler_top, lv.EVENT.ALL, None)
+lv.group_remove_obj(btn)
+
+btn = list2.add_btn(lv.SYMBOL.UP, "Up")
+btn.add_event_cb(event_handler_up, lv.EVENT.ALL, None)
+lv.group_remove_obj(btn)
+
+btn = list2.add_btn(lv.SYMBOL.LEFT, "Center")
+btn.add_event_cb(event_handler_center, lv.EVENT.ALL, None)
+lv.group_remove_obj(btn)
+
+btn = list2.add_btn(lv.SYMBOL.DOWN, "Down")
+btn.add_event_cb(event_handler_dn, lv.EVENT.ALL, None)
+lv.group_remove_obj(btn)
+
+btn = list2.add_btn(None, "Bottom")
+btn.add_event_cb(event_handler_bottom, lv.EVENT.ALL, None)
+lv.group_remove_obj(btn)
+
+btn = list2.add_btn(lv.SYMBOL.SHUFFLE, "Shuffle")
+btn.add_event_cb(event_handler_swap, lv.EVENT.ALL, None)
+lv.group_remove_obj(btn)