- android - 多次调用 OnPrimaryClipChangedListener
- android - 无法更新 RecyclerView 中的 TextView 字段
- android.database.CursorIndexOutOfBoundsException : Index 0 requested, 光标大小为 0
- android - 使用 AppCompat 时,我们是否需要明确指定其 UI 组件(Spinner、EditText)颜色
我想研究如何制作一个小的用户界面,用户可以在其中键入一些字母并根据给定的数据源(此处列出)获得一些建议,从而使搜索更容易。为此,我使用 Qt 的 QCompleter
类。
在匹配元素中,键入的字母应使用 HTML 突出显示,如下面代码中的示例:Au<b>st</b>ria
.最后,我将一些 SO 答案(参见 How to make item view render rich (html) text in Qt)和教程合并到一个小的独立模块中:
from PySide import QtCore, QtGui
class HTMLDelegate(QtGui.QStyledItemDelegate):
""" From: https://stackoverflow.com/a/5443112/1504082 """
def paint(self, painter, option, index):
options = QtGui.QStyleOptionViewItemV4(option)
self.initStyleOption(options, index)
if options.widget is None:
style = QtGui.QApplication.style()
else:
style = options.widget.style()
doc = QtGui.QTextDocument()
doc.setHtml(options.text)
doc.setTextWidth(option.rect.width())
options.text = ""
style.drawControl(QtGui.QStyle.CE_ItemViewItem, options, painter)
ctx = QtGui.QAbstractTextDocumentLayout.PaintContext()
# Highlighting text if item is selected
# if options.state & QtGui.QStyle.State_Selected:
# ctx.palette.setColor(QtGui.QPalette.Text,
# options.palette.color(QtGui.QPalette.Active,
# QtGui.QPalette.HighlightedText))
textRect = style.subElementRect(QtGui.QStyle.SE_ItemViewItemText,
options)
painter.save()
painter.translate(textRect.topLeft())
painter.setClipRect(textRect.translated(-textRect.topLeft()))
doc.documentLayout().draw(painter, ctx)
painter.restore()
def sizeHint(self, option, index):
options = QtGui.QStyleOptionViewItemV4(option)
self.initStyleOption(options, index)
doc = QtGui.QTextDocument()
doc.setHtml(options.text)
doc.setTextWidth(options.rect.width())
return QtCore.QSize(doc.size().width(), doc.size().height())
class CustomQCompleter(QtGui.QCompleter):
""" Implement "contains" filter mode as the filter mode "contains" is not
available in Qt < 5.2
From: https://stackoverflow.com/a/7767999/1504082 """
def __init__(self, parent=None):
super(CustomQCompleter, self).__init__(parent)
self.local_completion_prefix = ""
self.source_model = None
self.delegate = HTMLDelegate()
def setModel(self, model):
self.source_model = model
super(CustomQCompleter, self).setModel(self.source_model)
def updateModel(self):
local_completion_prefix = self.local_completion_prefix
# see: http://doc.qt.io/qt-4.8/model-view-programming.html#proxy-models
class InnerProxyModel(QtGui.QSortFilterProxyModel):
def filterAcceptsRow(self, sourceRow, sourceParent):
# model index mapping by row, 1d model => column is always 0
index = self.sourceModel().index(sourceRow, 0, sourceParent)
source_data = self.sourceModel().data(index, QtCore.Qt.DisplayRole)
# performs case insensitive matching
# return True if item shall stay in th returned filtered data
# return False to reject an item
return local_completion_prefix.lower() in source_data.lower()
proxy_model = InnerProxyModel()
proxy_model.setSourceModel(self.source_model)
super(CustomQCompleter, self).setModel(proxy_model)
# @todo: Why to be set here again?
self.popup().setItemDelegate(self.delegate)
def splitPath(self, path):
self.local_completion_prefix = path
self.updateModel()
return ""
class AutoCompleteEdit(QtGui.QLineEdit):
""" Basically from:
http://doc.qt.io/qt-5/qtwidgets-tools-customcompleter-example.html
"""
def __init__(self, list_data, separator=' ', addSpaceAfterCompleting=True):
super(AutoCompleteEdit, self).__init__()
# settings
self._separator = separator
self._addSpaceAfterCompleting = addSpaceAfterCompleting
# completer
self._completer = CustomQCompleter(self)
self._completer.setCaseSensitivity(QtCore.Qt.CaseInsensitive)
self._completer.setCompletionMode(QtGui.QCompleter.PopupCompletion)
self.model = QtGui.QStringListModel(list_data)
self._completer.setModel(self.model)
# connect the completer to the line edit
self._completer.setWidget(self)
# trigger insertion of the selected completion when its activated
self.connect(self._completer,
QtCore.SIGNAL('activated(QString)'),
self._insertCompletion)
self._ignored_keys = [QtCore.Qt.Key_Enter,
QtCore.Qt.Key_Return,
QtCore.Qt.Key_Escape,
QtCore.Qt.Key_Tab]
def _insertCompletion(self, completion):
"""
This is the event handler for the QCompleter.activated(QString) signal,
it is called when the user selects an item in the completer popup.
It will remove the already typed string with the one of the completion.
"""
stripped_text = self.text()[:-len(self._completer.completionPrefix())]
extra_text = completion # [-extra:]
if self._addSpaceAfterCompleting:
extra_text += ' '
self.setText(stripped_text + extra_text)
def textUnderCursor(self):
text = self.text()
textUnderCursor = ''
i = self.cursorPosition() - 1
while i >= 0 and text[i] != self._separator:
textUnderCursor = text[i] + textUnderCursor
i -= 1
return textUnderCursor
def keyPressEvent(self, event):
if self._completer.popup().isVisible():
if event.key() in self._ignored_keys:
event.ignore()
return
super(AutoCompleteEdit, self).keyPressEvent(event)
completionPrefix = self.textUnderCursor()
if completionPrefix != self._completer.completionPrefix():
self._updateCompleterPopupItems(completionPrefix)
if len(event.text()) > 0 and len(completionPrefix) > 0:
self._completer.complete()
if len(completionPrefix) == 0:
self._completer.popup().hide()
def _updateCompleterPopupItems(self, completionPrefix):
"""
Filters the completer's popup items to only show items
with the given prefix.
"""
self._completer.setCompletionPrefix(completionPrefix)
# self._completer.popup().setCurrentIndex(
# self._completer.completionModel().index(0, 0))
if __name__ == '__main__':
def demo():
import sys
app = QtGui.QApplication(sys.argv)
values = ['Germany',
'Au<b>st</b>ria',
'Switzerland',
'Hungary',
'The United Kingdom of Great Britain and Northern Ireland']
editor = AutoCompleteEdit(values)
window = QtGui.QWidget()
hbox = QtGui.QHBoxLayout()
hbox.addWidget(editor)
window.setLayout(hbox)
window.show()
sys.exit(app.exec_())
demo()
我的问题是用户 Timo 在答案 https://stackoverflow.com/a/5443112/1504082 中的建议:
After line: 'doc.setHtml(options.text)', you need to set also doc.setTextWidth(option.rect.width()), otherwise the delegate wont render longer content correctly in respect to target drawing area. For example does not wrap words in QListView.
所以我这样做是为了避免在完成者的弹出窗口中裁剪长文本。但我得到以下输出:
这个额外的垂直边距从何而来?
我稍微调查了一下,发现 sizeHint
HTMLDelegate
的方法|有时用 options
调用包含一个矩形的参数 (0, 0, 0, 0)
.在调用 doc.setTextWidth(options.rect.width())
之后,显示行为最终发生了变化。 .但我无法最终找出谁用这个参数调用它以及我如何才能正确解决这个问题。
有人可以解释这是从哪里来的,我该如何解决这个问题?
最佳答案
最后我找到了另一种实现它的方法,使用 https://stackoverflow.com/a/8036666/1504082 的想法.没有这些我还不明白的自定义绘图对我来说更有意义:)
from PySide import QtCore, QtGui
class TaskDelegate(QtGui.QItemDelegate):
# based on https://stackoverflow.com/a/8036666/1504082
# https://doc.qt.io/archives/qt-4.7/qitemdelegate.html#drawDisplay
# https://doc.qt.io/archives/qt-4.7/qwidget.html#render
margin_x = 5
margin_y = 3
def drawDisplay(self, painter, option, rect, text):
label = self.make_label(option, text)
# calculate render anchor point
point = rect.topLeft()
point.setX(point.x() + self.margin_x)
point.setY(point.y() + self.margin_y)
label.render(painter, point, renderFlags=QtGui.QWidget.DrawChildren)
def sizeHint(self, option, index):
# get text using model and index
text = index.model().data(index)
label = self.make_label(option, text)
return QtCore.QSize(label.width(), label.height() + self.margin_y)
def make_label(self, option, text):
label = QtGui.QLabel(text)
if option.state & QtGui.QStyle.State_Selected:
p = option.palette
p.setColor(QtGui.QPalette.WindowText,
p.color(QtGui.QPalette.Active,
QtGui.QPalette.HighlightedText)
)
label.setPalette(p)
label.setStyleSheet("border: 1px dotted black")
# adjust width according to widget's target width
label.setMinimumWidth(self.target_width - (2 * self.margin_x))
label.setMaximumWidth(self.target_width - self.margin_x)
label.setWordWrap(True)
label.adjustSize()
return label
class CustomQCompleter(QtGui.QCompleter):
""" Implement "contains" filter mode as the filter mode "contains" is not
available in Qt < 5.2
From: https://stackoverflow.com/a/7767999/1504082 """
def __init__(self, parent=None):
super(CustomQCompleter, self).__init__(parent)
self.local_completion_prefix = ""
self.source_model = None
self.delegate = TaskDelegate()
# widget not set yet
# self.delegate.target_width = self.widget().width()
def setModel(self, model):
self.source_model = model
super(CustomQCompleter, self).setModel(self.source_model)
def updateModel(self):
local_completion_prefix = self.local_completion_prefix
# see: http://doc.qt.io/qt-4.8/model-view-programming.html#proxy-models
class InnerProxyModel(QtGui.QSortFilterProxyModel):
def filterAcceptsRow(self, sourceRow, sourceParent):
# model index mapping by row, 1d model => column is always 0
index = self.sourceModel().index(sourceRow, 0, sourceParent)
source_data = self.sourceModel().data(index, QtCore.Qt.DisplayRole)
# performs case insensitive matching
# return True if item shall stay in th returned filtered data
# return False to reject an item
return local_completion_prefix.lower() in source_data.lower()
proxy_model = InnerProxyModel()
proxy_model.setSourceModel(self.source_model)
super(CustomQCompleter, self).setModel(proxy_model)
# @todo: Why to be set here again?
# -> rescale popup list items to widget width
self.delegate.target_width = self.widget().width()
self.popup().setItemDelegate(self.delegate)
def splitPath(self, path):
self.local_completion_prefix = path
self.updateModel()
return ""
class AutoCompleteEdit(QtGui.QLineEdit):
""" Basically from:
http://doc.qt.io/qt-5/qtwidgets-tools-customcompleter-example.html
"""
def __init__(self, list_data, separator=' ', addSpaceAfterCompleting=True):
super(AutoCompleteEdit, self).__init__()
# settings
self._separator = separator
self._addSpaceAfterCompleting = addSpaceAfterCompleting
# completer
self._completer = CustomQCompleter(self)
self._completer.setCaseSensitivity(QtCore.Qt.CaseInsensitive)
self._completer.setCompletionMode(QtGui.QCompleter.PopupCompletion)
self.model = QtGui.QStringListModel(list_data)
self._completer.setModel(self.model)
# connect the completer to the line edit
self._completer.setWidget(self)
# trigger insertion of the selected completion when its activated
self.connect(self._completer,
QtCore.SIGNAL('activated(QString)'),
self._insertCompletion)
self._ignored_keys = [QtCore.Qt.Key_Enter,
QtCore.Qt.Key_Return,
QtCore.Qt.Key_Escape,
QtCore.Qt.Key_Tab]
def _insertCompletion(self, completion):
"""
This is the event handler for the QCompleter.activated(QString) signal,
it is called when the user selects an item in the completer popup.
It will remove the already typed string with the one of the completion.
"""
stripped_text = self.text()[:-len(self._completer.completionPrefix())]
extra_text = completion # [-extra:]
if self._addSpaceAfterCompleting:
extra_text += ' '
self.setText(stripped_text + extra_text)
def textUnderCursor(self):
text = self.text()
textUnderCursor = ''
i = self.cursorPosition() - 1
while i >= 0 and text[i] != self._separator:
textUnderCursor = text[i] + textUnderCursor
i -= 1
return textUnderCursor
def keyPressEvent(self, event):
if self._completer.popup().isVisible():
if event.key() in self._ignored_keys:
event.ignore()
return
super(AutoCompleteEdit, self).keyPressEvent(event)
completionPrefix = self.textUnderCursor()
if completionPrefix != self._completer.completionPrefix():
self._updateCompleterPopupItems(completionPrefix)
if len(event.text()) > 0 and len(completionPrefix) > 0:
self._completer.complete()
if len(completionPrefix) == 0:
self._completer.popup().hide()
def _updateCompleterPopupItems(self, completionPrefix):
"""
Filters the completer's popup items to only show items
with the given prefix.
"""
self._completer.setCompletionPrefix(completionPrefix)
# self._completer.popup().setCurrentIndex(
# self._completer.completionModel().index(0, 0))
if __name__ == '__main__':
def demo():
import sys
app = QtGui.QApplication(sys.argv)
values = ['Germany',
'Au<b>st</b>ria',
'Switzerland',
'Hungary',
'The United Kingdom of Great Britain and Northern Ireland',
'USA']
editor = AutoCompleteEdit(values)
window = QtGui.QWidget()
hbox = QtGui.QHBoxLayout()
hbox.addWidget(editor)
window.setLayout(hbox)
window.show()
sys.exit(app.exec_())
demo()
关于python - 如何正确格式化 QCompleter 弹出列表的列表项?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/37943310/
我正在从事的项目需要使用 toString 方法打印银行帐户余额。我不允许向当前程序添加任何方法,但我需要将 myBalance 变量格式化为 double 型,该变量保留两位小数而不是一位。在这个特
我喜欢 Visual Studio (2008) 格式化 C# 代码的方式;不幸的是,在编写 C++ 代码时,它的行为方式似乎有所不同。 比如我这样写代码的时候: class Test { publi
Scanner scan = new Scanner(System.in); System.out.println("Enter three positive integers seperated b
在 aspose(使用 C#)中用于格式化数字的正确样式属性是什么。我想做两件事: 1) 将五位数字格式化为邮政编码。(我不太确定使用哪个 Style 属性来获取自定义 excel 邮政编码格式) 2
我希望用户输入从 00 到 23 和从 00 到 59 的 Local.Time 的小时和分钟,我将其扫描为一个 int。它有效,但对于从 00 到 09 的值,int 忽略 0,然后将其放置为 0,
大家好, 请查看上面的图片,我有两张 table 。在下面代码的第一个表中,我得到了这种格式。 但我想像 Table2 那样格式化,每个合并单元格中的行数是动态的,而且不一样。 有没有办法像table
我在一个 laravel 网站工作,我只是想知道是否有办法为用户格式化 created_at 值,因为现在它类似于以下内容: 2017-09-20 13:41 但我更愿意将其格式化为易于阅读的格式,例
我正在尝试在 JTextPane 中进行一些基本的格式化。为此,我决定使用 html(HTMLDocument 和 HTMLEditorKit)。 这里是按钮的操作监听器代码,应使所选文本变为粗体 b
是否有规则或插件会导致 es-lint 错误或警告,如果范围内的声明没有像下面那样间隔,赋值运算符的对齐方式相同? var a = 'a'; var bb = 'b'; var ccc = 'd
我正在尝试重新格式化 LinkedHashMap 的输出以排除逗号和大括号。 这是我的看跌期权: token.put("[Server.Protocol]", url.getProtocol() +
我有一个程序,可以从文本文件中读取大量文本,然后根据文本内容随机化内容以显示为短篇故事。该程序可以运行,但最后一部分(我显示的 Material )非常笨重且效率不高,我想知道是否有人对如何更有效地获
我正在尝试将 VIM 作为我的 ruby/rails 编辑器。太胖了,我对它的功能印象深刻 并且我能够安装以下插件以提供更好的 IDE 体验 自动配对 Better-snipmate-snippe
很难说出这里问的是什么。这个问题是含糊的、模糊的、不完整的、过于宽泛的或修辞性的,无法以目前的形式得到合理的回答。如需帮助澄清此问题以便重新打开它,visit the help center 。 已关
我有两个 jQuery 函数。我想先运行下面的第一个,然后在该函数完成后运行另一个。通常我会在代码的第一部分添加一个函数,但不确定如何使用这个 block 来做到这一点,或者它是否是正确的方法。 简而
在 Python 2.7 中,我有一个包含数字 1-25 字符串的列表(例如)。打印它们时,我希望列表打印 5 行,每行 5 个数字。 理想情况下: >>> print(myList) ['1', '
我有以下功能来打印借阅者已取出的书籍列表。 void searchBorrowerLoans(int a) { int i; for (i = 1
关闭。这个问题是opinion-based 。目前不接受答案。 想要改进这个问题吗?更新问题,以便 editing this post 可以用事实和引文来回答它。 . 已关闭 5 年前。 Improv
我正在尝试实现一个用作 ListView header 的 TextView。我想对其进行格式化,以便我基本上有一个以第一行为中心的标题,然后是以下几行的附加信息。如何格式化文本/字符串以创建这种格式
我尝试格式化数字字段 select to_char(12315.83453, 'FM999999999999D9999') 在这种情况下一切正常。结果是 12315.8345 但是如果值在0到1之间
我有一个带有 BigDecimal 字段的类。我把这个对象放到 JSP(Spring MVC)中。而且我需要显示十进制不带零的 BigDecimal 字段(20.00 就像 20),这就是为什么我的
我是一名优秀的程序员,十分优秀!