QCompleter 自定义补全规则 [英] QCompleter Custom Completion Rules

问题描述

我使用的是 Qt4.6，我有一个带有 QCompleter 的 QComboBox.

I'm using Qt4.6 and I have a QComboBox with a QCompleter in it.

通常的功能是基于前缀提供完成提示(这些可以在下拉列表中而不是内联中 - 这是我的用法).例如，给定

The usual functionality is to provide completion hints (these can be in a dropdown rather than inline - which is my usage) based on a prefix. For example, given

chicken soup
chilli peppers
grilled chicken

输入 ch 将匹配 chicken soup 和 辣椒 但不匹配 grilled chicken.

entering ch would match chicken soup and chilli peppers but not grilled chicken.

我想要的是能够输入 ch 并匹配所有这些，或者更具体地说，chicken 并匹配 chicken soup 和烤鸡.
我还希望能够将 chs 之类的标签分配给 chicken soup 以生成另一个匹配项，而不仅仅是文本内容.我可以处理算法但是，

What I want is to be able to enter ch and match all of them or, more specifically, chicken and match chicken soup and grilled chicken.
I also want to be able to assign a tag like chs to chicken soup to produce another match which is not just on the text's content. I can handle the algorithm but,

我需要覆盖 QCompleter 的哪些功能?
我不太确定我应该去哪里找...

Which of QCompleter's functions do I need to override?
I'm not really sure where I should be looking...

推荐答案

基于@j3frea 的建议，这里是一个工作示例(使用 PySide).看来每次调用 splitPath 时都需要设置模型(在 setModel 中设置一次代理不起作用).

Based on @j3frea suggestion, here is a working example (using PySide). It appears that the model needs to be set every time splitPath is called (setting the proxy once in setModel doesn't work).

combobox.setEditable(True)
combobox.setInsertPolicy(QComboBox.NoInsert)

class CustomQCompleter(QCompleter):
    def __init__(self, parent=None):
        super(CustomQCompleter, self).__init__(parent)
        self.local_completion_prefix = ""
        self.source_model = None

    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
        class InnerProxyModel(QSortFilterProxyModel):
            def filterAcceptsRow(self, sourceRow, sourceParent):
                index0 = self.sourceModel().index(sourceRow, 0, sourceParent)
                return local_completion_prefix.lower() in self.sourceModel().data(index0).lower()
        proxy_model = InnerProxyModel()
        proxy_model.setSourceModel(self.source_model)
        super(CustomQCompleter, self).setModel(proxy_model)

    def splitPath(self, path):
        self.local_completion_prefix = path
        self.updateModel()
        return ""


completer = CustomQCompleter(combobox)
completer.setCompletionMode(QCompleter.PopupCompletion)
completer.setModel(combobox.model())

combobox.setCompleter(completer)

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