Skip to content

HTTPS clone URL

Subversion checkout URL

You can clone with HTTPS or Subversion.

Download ZIP
tree: 9ef2b7bcb8
Fetching contributors…

Cannot retrieve contributors at this time

992 lines (835 sloc) 31.727 kb
# Copyright (C) 2010 Jim Washington
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# ui borrowed from http://decafbad.com/2009/07/drag-and-drop/api-demos.html
import pyjd
from pyjamas.ui import HasVerticalAlignment
from pyjamas.Timer import Timer
from datetime import datetime
from __pyjamas__ import doc
from pyjamas.ui.Widget import Widget
from pyjamas import DOM
from pyjamas.ui.Label import Label
from pyjamas.ui.Button import Button
from pyjamas.ui.HTML import HTML
from pyjamas.ui.RootPanel import RootPanel
from pyjamas.ui.VerticalPanel import VerticalPanel
from pyjamas.ui.HorizontalPanel import HorizontalPanel
from pyjamas.Canvas.GWTCanvas import GWTCanvas
import pyjamas.Canvas.Color as Color
from pyjamas.dnd import makeDraggable
from pyjamas.ui.DragWidget import DragWidget, DragContainer
from pyjamas.ui.DropWidget import DropWidget
from pyjamas.ui.Panel import Panel
from pyjamas.dnd import getTypes
from pyjamas import Window
import json
class DNDDemos(VerticalPanel):
def __init__(self):
VerticalPanel.__init__(self)
self.width = '100%'
self.setID('content')
self.add(TopVerbage())
self.add(NewSchool())
self.add(Delegated())
self.add(ImageDrop())
self.add(DataTransferDemo())
self.add(DragEffects())
self.add(AbsolutePosition())
self.add(MultiTargetDemo())
class AddablePanel(Panel):
def __init__(self, **kw):
Panel.__init__(self, **kw)
def add(self, widget, container=None):
self.adopt(widget, self.getElement())
self.children.append(widget)
def remove(self, widget):
self.disown(widget)
self.children.remove(widget)
class TopVerbage(AddablePanel):
title = "Drag and Drop in %s Pyjamas"
def __init__(self):
AddablePanel.__init__(self, Element=DOM.createElement('div'))
self.setID('toc')
img = '<img id="logo" src="pyjamas.png">'
self.add(HTML('<h1>%s</h1>' % (self.title % img,)))
self.add(HTML(
"""
<p>This page is a reimagining of
<a href="http://decafbad.com/2009/07/drag-and-drop/api-demos.html">
http://decafbad.com/2009/07/drag-and-drop/api-demos.html</a> using
pyjamas.</p>
<p>
<p>This page offers a few demonstrations and experiments, mostly
as a test tool for the background implementation.</p>
"""
))
class DragWidget1(DragWidget, Label):
def __init__(self):
Label.__init__(self, Element=DOM.createElement('div'))
self.setText("Drag me!")
DragWidget.__init__(self)
self.setStyleName('dragme1')
def onDragStart(self, event):
dt = event.dataTransfer
#self.addMessage('types is %s' % dt.getTypes())
dt.setData('Text', 'Dropped in zone!')
#self.addMessage('after setting, len is %s' % len(dt.dataStore.items))
#self.addMessage('types is %s' % dt.getTypes())
#dt.setDragImage(self.getElement(), 15, 15)
dt.effectAllowed = 'copy'
#self.addMessage('mode is %s' % dt.dataStore.items.mode)
def onDragEnd(self, event):
self.addMessage('Drag ended')
#self.addMessage('mode is %s' % dt._data.mode)
def addMessage(self, message):
parent = self.getParent()
while not hasattr(parent, 'addMessage'):
parent = parent.getParent()
parent.addMessage(message)
class DropWidget1(DropWidget, Label):
def __init__(self):
Label.__init__(self, Element=DOM.createElement('div'))
DropWidget.__init__(self)
self.setText("Drop here!")
self.setStyleName('drophere')
def onDragEnter(self, event):
self.addStyleName('dragover')
DOM.eventPreventDefault(event)
def onDragLeave(self, event):
self.removeStyleName('dragover')
def onDragOver(self, event):
DOM.eventPreventDefault(event)
def onDrop(self, event):
dt = event.dataTransfer
#'text', 'text/plain', and 'Text' are equivalent.
try:
item = dt.getData("text/plain")
self.addMessage(item)
except:
self.addMessage('unsupported data type')
DOM.eventPreventDefault(event)
#DOM.eventStopPropagation(event)
def addMessage(self, message):
parent = self.getParent()
while not hasattr(parent, 'addMessage'):
parent = parent.getParent()
parent.addMessage(message)
class Messages(Widget):
def __init__(self):
Widget.__init__(self, Element=DOM.createElement('ul'))
self.setStyleName('messages')
self.addStyleName('events_monitor')
def addMessage(self, text):
d = datetime.now().strftime("%x %X")
li = DOM.createElement('li')
DOM.setInnerHTML(li,
'<dt class="time">%s</dt><dd class="txt">%s</dd>' % (
d, text))
DOM.insertChild(self.element, li, 0)
class DNDDemo(AddablePanel):
"""
Template for the demos.
drag_widget goes on the left. drop_widget goes
on the right, and the message display goes on the bottom. add_message makes
it easy to display anything you want for debugging.
"""
title = "DND Demo"
id = 'none'
drag_widget = None
drop_widget = None
def __init__(self):
AddablePanel.__init__(self, Element=DOM.createElement('div'))
self.setID(self.id)
self.h2 = HTML('<h2>%s</h2>' % self.title)
self.append(self.h2)
demo_div = AddablePanel(Element=DOM.createElement('div'))
demo_div.setStyleName('demo')
top_frame = HorizontalPanel()
g = self.drag_widget
if g is not None:
top_frame.add(g)
p = self.drop_widget
if p is not None:
top_frame.add(p)
demo_div.add(top_frame)
self.messages = Messages()
demo_div.append(self.messages)
self.add(demo_div)
def addMessage(self, message):
self.messages.addMessage(message)
class NewSchool(DNDDemo):
def __init__(self):
self.title = "Drag and drop"
self.id = 'newschool'
self.drag_widget = DragWidget1()
self.drop_widget = DropWidget1()
DNDDemo.__init__(self)
class DragWidget2(DragContainer, AddablePanel):
def onDragStart(self, event):
target = DOM.eventGetTarget(event)
dt = event.dataTransfer
dt.setData("Text", "Dropped %s" % target.id)
dt.effectAllowed = 'copy'
def __init__(self):
self.setElement(DOM.createElement('ul'))
DragContainer.__init__(self)
AddablePanel.__init__(self)
def onLoad(self):
link = self.makeLink()
link.addClickListener(self)
li = AddablePanel(Element=DOM.createElement('li'))
li.add(link)
self.button = li
self.add(self.button)
for k in range(3):
self.addDragWidget()
def addMessage(self, message):
parent = self.getParent()
while not hasattr(parent, 'addMessage'):
parent = parent.getParent()
parent.addMessage(message)
def addDragWidget(self):
self.remove(self.button)
s = len(self.children)
w = Label(Element=DOM.createElement('li'))
w.setID('drag' + str(s))
w.setStyleName('dragme')
w.setText('Drag ' + str(s))
self.add(w)
makeDraggable(w)
self.add(self.button)
def makeLink(self):
link = Button()
link.setText("+ Add another")
return link
def onClick(self, sender):
self.addDragWidget()
class DropWidget2(DropWidget, AddablePanel):
def __init__(self):
self.setElement(DOM.createElement('ul'))
DropWidget.__init__(self)
AddablePanel.__init__(self)
def onLoad(self):
button = self.makeButton()
button.addClickListener(self)
li = AddablePanel(Element=DOM.createElement('li'))
li.add(button)
self.button = li
self.add(self.button)
for k in range(3):
self.addDropWidget()
def addDropWidget(self):
self.remove(self.button)
s = len(self.children)
w = Label(Element=DOM.createElement('li'))
w.setID('drop' + str(s))
w.setStyleName('drophere')
w.setText('Drop ' + str(s))
self.append(w)
self.append(self.button)
def onDragEnter(self, event):
target = DOM.eventGetTarget(event)
t = Widget(Element=target)
try:
class_names = t.getStyleName()
except:
class_names = None
dt = event.dataTransfer
dt.dropEffect = 'copy'
if class_names is not None:
if 'drophere' in class_names:
t.addStyleName('dragover')
DOM.eventPreventDefault(event)
def onDragOver(self, event):
target = DOM.eventGetTarget(event)
t = Widget(Element=target)
dt = event.dataTransfer
dt.dropEffect = 'copy'
class_names = t.getStyleName()
if class_names is not None:
if 'drophere' in class_names:
DOM.eventPreventDefault(event)
def onDragLeave(self, event):
target = DOM.eventGetTarget(event)
t = Widget(Element=target)
try:
class_names = t.getStyleName()
except:
class_names = None
if class_names is not None:
if 'drophere' in class_names:
t.removeStyleName('dragover')
def onDrop(self, event):
dt = event.dataTransfer
text = dt.getData('Text')
target = DOM.eventGetTarget(event)
t = Widget(Element=target)
class_names = t.getStyleName()
DOM.eventPreventDefault(event)
if class_names is not None:
if 'drophere' in class_names:
self.addMessage('%s onto %s' % (text, target.id))
return
def makeButton(self):
button = Button("+ Add another")
return button
def onClick(self, sender):
self.addDropWidget()
def addMessage(self, message):
parent = self.getParent()
while not hasattr(parent, 'addMessage'):
parent = parent.getParent()
parent.addMessage(message)
class Delegated(DNDDemo):
title = "DND with Event Delegation"
id = "delegated"
def __init__(self):
self.drag_widget = DragWidget2()
drag = self.drag_widget
drag.setStyleName('drag_delegates')
drag.addStyleName('draglist')
self.drop_widget = DropWidget2()
drop = self.drop_widget
drop.setStyleName('drop_delegates')
drop.addStyleName('droplist')
DNDDemo.__init__(self)
class DragWidget3(DragWidget2):
def __init__(self):
self.setElement(DOM.createElement('ul'))
super(DragWidget3, self).__init__()
def onLoad(self):
self.setStyleName('drag_delegates')
self.addStyleName('draglist')
for k in range(4):
self.addDragWidget()
def makeCanvasImg(self, canvas):
ctx = canvas
ctx.beginPath()
ctx.setLineWidth(3)
ctx.setStrokeStyle(Color.ORANGE)
ctx.moveTo(25, 1.5)
ctx.lineTo(50, 50)
ctx.lineTo(1.5, 50)
ctx.lineTo(25, 1.5)
ctx.stroke()
def onDragStart(self, event):
dt = event.dataTransfer
target = DOM.eventGetTarget(event)
target = Widget(Element=target)
id = target.getID()
dt.setData("Text", "Dropped %s" % target.getID())
dt.effectAllowed = 'copy'
if id == 'imgdrag1':
parent = self.getParent()
while not hasattr(parent, 'h2'):
parent = parent.getParent()
dt.setDragImage(parent.h2.getElement(), 10, 10)
elif id == 'imgdrag2':
dt.setDragImage(doc().getElementById('logo'), 10, 10)
elif id == 'imgdrag3':
# OK, it's a bit of a cheat, but the following works on current
# Opera, IE, Firefox, Safari, Chrome.
ctx = GWTCanvas(50, 50)
self.makeCanvasImg(ctx)
try:
img = DOM.createImg()
DOM.setAttribute(img, 'src', ctx.canvas.toDataURL())
dt.setDragImage(img, 25, 25)
except:
dt.setDragImage(ctx.canvas, 25, 25)
def addDragWidget(self):
s = len(self.children)
w = Label(Element=DOM.createElement('li'))
w.setStyleName('dragme')
w.setID('imgdrag' + str(s))
texts = ['Default',
'Element',
'Image',
'Canvas'
]
w.setText(texts[s])
self.add(w)
makeDraggable(w)
class DropWidget3(DropWidget1):
def onLoad(self):
self.setID("imgdrop")
class ImageDrop(DNDDemo):
def __init__(self):
self.title = "Using drag feedback images"
self.id = "feedback_image"
self.drop_widget = DropWidget3()
self.drag_widget = DragWidget3()
DNDDemo.__init__(self)
class DragWidget4(DragWidget2):
def __init__(self):
self.setElement(DOM.createElement('ul'))
super(DragWidget4, self).__init__()
def onLoad(self):
self.setStyleName('drag_delegates')
self.addStyleName('draglist')
self.following_text = HTML("""<li><p>
... and try dragging to other windows and applications.
</p></li>
""")
for k in range(3):
self.addDragWidget()
self.append(self.following_text)
def addDragWidget(self):
s = len(self.children)
w = Label(Element=DOM.createElement('li'))
w.setID('datadrag' + str(s))
w.setStyleName('dragme')
texts = ['Text',
'Text / HTML / URI',
'Disallowed']
w.setText(texts[s])
self.append(w)
makeDraggable(w)
def onDragStart(self, event):
dt = event.dataTransfer
target = DOM.eventGetTarget(event)
target = Widget(Element=target)
try:
id = target.getID()
except:
id = ''
if id == 'datadrag0':
dt.setData('text/plain', 'Hello World!')
elif id == 'datadrag1':
logo = doc().getElementById('logo')
logo_parent_element = DOM.getParent(logo)
text = DOM.getInnerText(logo_parent_element)
html = DOM.getInnerHTML(logo_parent_element)
uri = DOM.getAttribute(logo, 'src')
dt.setData('text/plain', text)
dt.setData('text/html', html)
dt.setData('text/uri-list', uri)
elif id == 'datadrag2':
dt.setData('x-star-trek/tribble', 'I am a tribble')
class DropWidget4(DropWidget1):
def onLoad(self):
self.setText('''Drop here from items on the left - and selected
content from other windows and applications.''')
self.setID('datadrop')
def onDrop(self, event):
dt = event.dataTransfer
types = getTypes(event)
self.addMessage("drop types received: " + ", ".join(types))
parent = self.getParent()
parent.clearContent()
self.addMessage('dt: ' + str(dt))
types.sort()
for ctype in types:
data = dt.getData(ctype)
if ctype == 'Files':
file_names = []
files = dt.files
# files is a FileList
# http://help.dottoro.com/ljuelxgf.php
for idx in range(files.length):
item = files.item(idx)
try:
name = item.name
except:
name = item.fileName
file_names.append(name)
data = '<br>'.join(file_names)
parent.addContent(ctype, data)
DOM.eventPreventDefault(event)
# cancel bubble so first file is not opened in browser.
DOM.eventCancelBubble(event, True)
def onDragOver(self, event):
types = getTypes(event)
if not 'x-star-trek/tribble' in types:
self.addStyleName('dragover')
DOM.eventPreventDefault(event)
def onDragEnter(self, event):
types = getTypes(event)
if not 'x-star-trek/tribble' in types:
self.addStyleName('dragover')
DOM.eventPreventDefault(event)
class ContentDisplay(Label, AddablePanel):
def __init__(self, ctype, data):
Label.__init__(self)
AddablePanel.__init__(self)
self.setStyleName('content_text')
self.setText("'%s' content:" % ctype)
self.content = HTML(data, StyleName='content')
self.append(self.content)
class DropWidgetPanel4(AddablePanel):
def __init__(self):
AddablePanel.__init__(self, Element=DOM.createElement('div'))
def onLoad(self):
self.drop_widget = DropWidget4()
self.add(self.drop_widget)
self.contentPanel = AddablePanel(Element=DOM.createElement('div'))
self.add(self.contentPanel)
def clearContent(self):
self.contentPanel.clear()
def addContent(self, ctype, data):
display = ContentDisplay(ctype, data)
self.contentPanel.add(display)
class DataTransferDemo(DNDDemo):
def __init__(self):
self.title = "Using data transfer content types"
self.id = "data_transfer"
self.drag_widget = DragWidget4()
self.drop_widget = DropWidgetPanel4()
DNDDemo.__init__(self)
class DragWidget5(DragWidget2):
def onDragStart(self, event):
target = DOM.eventGetTarget(event)
dt = event.dataTransfer
try:
id = Widget(Element=target).getID()
except:
id = ''
dt.setData("Text", "Dropped %s" % id)
effect_allowed = self.data[int(id[-1])]
dt.effectAllowed = effect_allowed
def onLoad(self):
self.setStyleName('drag_delegates')
self.addStyleName('draglist')
self.data = ['copy', 'move', 'link', 'all', 'none']
for k in range(5):
self.addDragWidget()
def addDragWidget(self):
s = len(self.children)
w = Label(Element=DOM.createElement('li'))
w.setID('effectdrag' + str(s))
w.setStyleName('dragme')
w.setText('Drag %s (%s)' % (s, self.data[s]))
self.add(w)
makeDraggable(w)
class DropWidget5(DropWidget2):
def onLoad(self):
self.data = ['copy', 'move', 'link', 'all', 'none']
self.setStyleName('drop_delegates')
self.addStyleName('droplist')
for k in range(5):
self.addDropWidget()
def addDropWidget(self):
s = len(self.children)
w = Label(Element=DOM.createElement('li'))
w.setID('effectdrop' + str(s))
w.setStyleName('drophere')
w.setText('Drop %s (%s)' % (s, self.data[s]))
self.append(w)
def onDragEnter(self, event):
target = DOM.eventGetTarget(event)
t = Widget(Element=target)
try:
class_names = t.getStyleName()
except:
class_names = None
if class_names is not None:
if 'drophere' in class_names:
t.addStyleName('dragover')
DOM.eventPreventDefault(event)
def onDragOver(self, event):
target = DOM.eventGetTarget(event)
t = Widget(Element=target)
class_names = t.getStyleName()
if class_names is not None:
if 'drophere' in class_names:
dt = event.dataTransfer
id = Widget(Element=target).getID()
drop_effect = self.data[int(id[-1])]
dt.dropEffect = drop_effect
DOM.eventPreventDefault(event)
def onDragLeave(self, event):
target = DOM.eventGetTarget(event)
t = Widget(Element=target)
try:
class_names = t.getStyleName()
except:
class_names = None
if class_names is not None:
if 'drophere' in class_names:
t.removeStyleName('dragover')
def onDrop(self, event):
dt = event.dataTransfer
text = dt.getData('Text')
target = DOM.eventGetTarget(event)
t = Widget(Element=target)
class_names = t.getStyleName()
if class_names is not None:
if 'drophere' in class_names:
self.addMessage('%s onto %s<br>effectAllowed=%s, dropEffect=%s'
% (text, target.id, dt.effectAllowed, dt.dropEffect))
DOM.eventPreventDefault(event)
class DragEffects(DNDDemo):
def __init__(self):
self.title = "Using drag effects"
self.id = "data_transfer"
self.drag_widget = DragWidget5()
self.drop_widget = DropWidget5()
DNDDemo.__init__(self)
class AbsolutePosition(DNDDemo):
def __init__(self):
self.title = "Absolute Position Drag and Drop"
self.id = "absolute_position"
self.drop_widget = Drop6Container()
DNDDemo.__init__(self)
class Drop6Container(HorizontalPanel):
def __init__(self):
HorizontalPanel.__init__(self)
left = DropWidget6()
right = DropWidget6()
self.setSpacing('10px')
drag = DragWidget6("Drag1")
drag2 = DragWidget6("Drag2")
left.add(drag2)
drag2.setStyleAttribute('top', '0')
drag2.setStyleAttribute('left', '0')
makeDraggable(drag2)
left.add(drag)
drag.setStyleAttribute('top', '0')
drag.setStyleAttribute('left', '100')
makeDraggable(drag)
self.add(left)
self.add(right)
class DragWidget6(Label):
def __init__(self, text):
Label.__init__(self, text)
self.setStyleName('dragme2')
self.setStyleAttribute('position', 'absolute')
class DropWidget6(DropWidget, DragContainer, AddablePanel):
def __init__(self):
AddablePanel.__init__(self, Element=DOM.createElement('div'))
DropWidget.__init__(self)
DragContainer.__init__(self)
self.setStyleName('drophere2')
self.setStyleAttribute('position', 'relative')
self.setSize('300px', '300px')
def onDragStart(self, event):
dt = event.dataTransfer
target = DOM.eventGetTarget(event)
clientX = event.clientX
clientY = event.clientY
absx = clientX + Window.getScrollLeft()
absy = clientY + Window.getScrollTop()
package = json.dumps({"text": DOM.getInnerText(target),
"offsetX": absx - DOM.getAbsoluteLeft(target),
"offsetY": absy - DOM.getAbsoluteTop(target)})
dt.setData('text', package)
# using "copy" here because Windows Chrome does not like "move"
dt.allowedEffects = 'copy'
self.movingWidget = None
for widget in self.children:
if target == widget.getElement():
self.movingWidget = widget
def onDragLeave(self, event):
dt = event.dataTransfer
dt.dropEffect = 'none'
def onDrag(self, event):
self.movingWidget.addStyleName('invisible')
def onDragEnd(self, event):
dt = event.dataTransfer
self.addMessage('Drop effect is "%s"' % dt.dropEffect)
if dt.dropEffect != 'none':
self.remove(self.movingWidget)
else:
# Restore widget visibility. Allow 0.5 seconds for the fly-back.
def ontimer(timer):
self.movingWidget.removeStyleName('invisible')
Timer(500, notify=ontimer)
def onDragEnter(self, event):
DOM.eventPreventDefault(event)
def onDragOver(self, event):
dt = event.dataTransfer
dt.dropEffect = 'copy'
DOM.eventPreventDefault(event)
def onDrop(self, event):
dt = event.dataTransfer
text = dt.getData('text')
package = json.loads(text)
x = DOM.eventGetClientX(event)
y = DOM.eventGetClientY(event)
scrollY = Window.getScrollTop()
scrollX = Window.getScrollLeft()
offsetX = int(package['offsetX'])
offsetY = int(package['offsetY'])
at = self.getAbsoluteTop()
al = self.getAbsoluteLeft()
posX, posY = x - (al - scrollX), y - (at - scrollY)
w = DragWidget6(package['text'])
self.add(w)
makeDraggable(w)
# firefox seems to be off-by-one in x.
# firefox-specific code?
#w.setStyleAttribute('left', posX - offsetX -1)
w.setStyleAttribute('left', posX - offsetX)
w.setStyleAttribute('top', posY - offsetY)
w.removeStyleName('invisible')
self.addMessage(
"top:%s, left:%s, cy:%s cx:%s, sy:%s sx:%s dropy:%s dropx:%s" % (
at, al, y, x, scrollY, scrollX, posY, posX))
DOM.eventPreventDefault(event)
def addMessage(self, message):
parent = self.getParent()
while not hasattr(parent, 'addMessage'):
parent = parent.getParent()
parent.addMessage(message)
class StudentWidget(Label):
def __init__(self, name, age):
#Label.__init__(self, Element=DOM.createElement('div'))
#self.dragHandler = DragHandler()
#self.dragHandler.addDragListener(self)
Label.__init__(self, Element=DOM.createElement('li'))
self.student_name = name
self.age = int(age)
self.setText("%s (%s)" % (self.student_name, self.age))
self.setStyleName('dragme')
#self.addStyleName('age_%s' % self.age)
def onClick(self, sender):
self.addMessage("clicked")
def addMessage(self, message):
parent = self.getParent()
while not hasattr(parent, 'addMessage'):
parent = parent.getParent()
parent.addMessage(message)
class StudentContainer(DragContainer, DropWidget, VerticalPanel):
def __init__(self, min_age, max_age, id):
self.min_age = min_age
self.max_age = max_age
VerticalPanel.__init__(self)
DropWidget.__init__(self)
DragContainer.__init__(self)
self.setID(id)
self.setWidth(200)
self.setHeight(300)
self.setVerticalAlignment(HasVerticalAlignment.ALIGN_TOP)
self.setStyleName('drophere2')
self.addTitle()
def getNames(self):
names = []
for item in self.children:
if isinstance(item, StudentWidget):
names.append((item.student_name, item.age))
return names
def addTitle(self):
self.append(Label("Allowed: %s to %s" % (self.min_age, self.max_age)))
def addStudent(self, name, age):
new_names = self.getNames()
found = False
for item in new_names:
if item == (name, age):
found = True
break
if not found:
new_names.append((name, age))
new_names.sort()
while len(self.children):
self.remove(self.children[0])
#self.clear()
self.addTitle()
for student in new_names:
sw = StudentWidget(student[0], student[1])
makeDraggable(sw)
self.append(sw)
self.setCellVerticalAlignment(sw, HasVerticalAlignment.ALIGN_TOP)
def onDragStart(self, event):
self.removeStyleName('drop_fail')
dt = event.dataTransfer
dt.effectAllowed = 'copy'
target = DOM.eventGetTarget(event)
widget = None
for widget in self.children:
if widget.getElement() == target:
self.movingWidget = widget
break
dt.setData('Text', json.encode({'name': widget.student_name,
'age': widget.age,
'parent': self.getID()}))
def onDrag(self, event):
self.movingWidget.addStyleName('invisible')
def onDragEnd(self, event):
dt = event.dataTransfer
styles = self.getStyleName()
if dt.dropEffect != 'none' and not 'drop_fail' in styles:
self.remove(self.movingWidget)
msg = 'drop succeeded'
else:
self.movingWidget.removeStyleName('invisible')
msg = 'drop failed'
self.addMessage(msg)
def onDragEnter(self, event):
self.addStyleName('dragover')
DOM.eventPreventDefault(event)
def onDragLeave(self, event):
self.removeStyleName('dragover')
def onDragOver(self, event):
DOM.eventPreventDefault(event)
def age_is_ok(self, age):
return age >= self.min_age and age <= self.max_age
def onDrop(self, event):
dt = event.dataTransfer
item = dt.getData("Text")
data = json.decode(item)
if 'name' in data and 'age' in data:
age = data['age']
name = data['name']
self.removeStyleName('dragover')
if self.age_is_ok(age):
self.addStudent(name, age)
dt.dropEffect = 'copy'
self.addStyleName('flash')
def removeFlash(timer):
self.removeStyleName('flash')
Timer(250, notify=removeFlash)
else:
dt.dropEffect = 'none'
self.addMessage('student could not be added')
# setting dropEffect to 'none' should be sufficient to notify
# that the drop failed, but
# we need to cheat a bit for now...
# this is the only reason for parent id in data
item_parent_id = data['parent']
item_parent = self.parent.containerFromId(item_parent_id)
item_parent.addStyleName('drop_fail')
# prevent default allows onDragEnd to see the dropEffect we set here
DOM.eventPreventDefault(event)
def addMessage(self, message):
parent = self.getParent()
while not hasattr(parent, 'addMessage'):
parent = parent.getParent()
parent.addMessage(message)
class ClassContainer(HorizontalPanel):
def __init__(self):
HorizontalPanel.__init__(self)
#self.setSpacing('10px')
pool = StudentContainer(1, 20, 'pool_1')
for item in [['Fred', 12], ['Jane', 10], ['Sam', 18],
['Ginger', 8], ['Mary', 4]]:
pool.addStudent(name=item[0], age=item[1])
self.append(pool)
self.append(StudentContainer(6, 13, 'pool_2'))
self.append(StudentContainer(11, 20, 'pool_3'))
self.setSpacing('10px')
def containerFromId(self, id):
for item in self.children:
if item.getID() == id:
return item
class MultiTargetDemo(DNDDemo):
def __init__(self):
self.drop_widget = ClassContainer()
self.title = 'Drop with Validation'
self.id = 'multi'
DNDDemo.__init__(self)
if __name__ == '__main__':
pyjd.setup("./public/DNDTest.html")
j = RootPanel()
j.add(DNDDemos())
pyjd.run()
Jump to Line
Something went wrong with that request. Please try again.