用于只读、可滚动、可折叠、图标列表的 Qt 小部件

发布于 2024-09-18 08:51:19 字数 687 浏览 2 评论 0原文

我对 Qt 比较陌生,并且不太熟悉开箱即用的小部件。我有一个有点(但不是非常)复杂的小部件要创建,并且不想重新发明任何轮子。什么是最好的 QWidget 作为子类和/或 QWidget 的起点来组成我的小部件。这是我正在寻找的最终结果(对粗略的绘图表示歉意):

Widget
(来源:drmtempsoimages at site.google.com)

要点:

  • 所有图标都将采用相同的大小,例如 128 x 128。忽略类别分组,它们应该全部对齐在一个漂亮的网格中。
  • 小部件应该展开以填充它可以占据的所有水平和垂直区域。水平扩展/缩小可能会增加/减少每行显示的图标数量。
  • 图标被分组,并且这些组应该是可折叠的。
  • 如果小部件的高度超过其空间,则应出现垂直滚动条。

I'm relatively new to Qt, and am not entirely familiar with the out-of-the-box widgets. I have a somewhat (but not very) complex widget to create, and don't want to reinvent any wheels. What is the best QWidget to use as a starting point to subclass and/or QWidgets to use to compose my widget. Here is the end-result I am looking for (apologies for the crude drawing):

Widget
(source: drmtempsoimages at sites.google.com)

Key points:

  • All icons will take up the same size, say 128 x 128. Ignoring the category groupings, they should all align in a nice grid.
  • The widget should expand to fill all the horizontal and vertical area it can take. Expanding / shrinking horizontally may increase / decrease the number of icons shown in each row.
  • Icons are grouped, and those groups should be collapsible.
  • If the height of the widget exceeds its space, a vertical scrollbar should appear.

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请你别敷衍 2024-09-25 08:51:19

您实际上正在为 QListView/QListWidget 寻找一些更深奥的选项。

在顶层,添加 QTreeWidgetQTreeView 将为您提供所需的层次结构,并管理滚动区域。

(展开的)QTreeXItem 的每个 Listed Item 都将是一个 QListView/QListWidget,设置 setViewMode(QListView::IconMode)代码> 他们。

编辑:
请注意,要获得上面您想要的精确外观,您可能必须使用 QListView 并使用自定义委托,自己处理绘图(除非您能找到一个完全符合您要求的主题)。不过,我在下面使用 Q*Widget 类编写了一个简短的 PyQt 解决方案,因为它们更短,并且仍然演示如何获得正确的布局。如果您使用 C++,则适用相同的 Qt 函数调用,但显然您可能有更多或更少的簿记。

import sys
from PyQt4 import QtGui, QtCore

class displayItem(QtGui.QWidget):  #A simple widget to display, just centers a digit in a 100x100 widget
    def __init__(self,num):
        QtGui.QWidget.__init__(self)
        self.size=100
        self.resize(self.size,self.size)
        self.setMinimumSize(self.size,self.size)
        self.text = num
    def paintEvent(self,event):
        p = QtGui.QPainter(self)
        p.drawText(self.size//2,self.size//2,str(self.text))

app = QtGui.QApplication(sys.argv)
widget = QtGui.QTreeWidget()
widget.setWindowTitle('simple tree')

#Build the list widgets
treeItem1 = QtGui.QTreeWidgetItem(widget)
treeItem1.setText(0,"TreeWidget Parent")   #Sets the "header" for your [+] box

list1 = QtGui.QListWidget()                #This will contain your icon list
list1.setMovement(QtGui.QListView.Static)  #otherwise the icons are draggable
list1.setResizeMode(QtGui.QListView.Adjust) #Redo layout every time we resize
list1.setViewMode(QtGui.QListView.IconMode) #Layout left-to-right, not top-to-bottom

listItem = QtGui.QListWidgetItem(list1)
listItem.setSizeHint(QtCore.QSize(100,100)) #Or else the widget items will overlap (irritating bug)
list1.setItemWidget(listItem,displayItem(1))

listItem = QtGui.QListWidgetItem(list1)     #Add a few more items
listItem.setSizeHint(QtCore.QSize(100,100))
list1.setItemWidget(listItem,displayItem(2))

listItem = QtGui.QListWidgetItem(list1)
listItem.setSizeHint(QtCore.QSize(100,100))
list1.setItemWidget(listItem,displayItem(3))

list1.setAutoFillBackground(True)                #Required for a widget that will be a QTreeWidgetItem widget
treeSubItem1 = QtGui.QTreeWidgetItem(treeItem1)  #Make a subitem to hold our list
widget.setItemWidget(treeSubItem1,0,list1)       #Assign this list as a tree item

treeItem2 = QtGui.QTreeWidgetItem(widget)        #Make a fake second parent
treeItem2.setText(0,"TreeWidget Parent II")

widget.show()           #kick off the app in standard PyQt4 fashion
sys.exit(app.exec_())

You're actually looking for some of the more esoteric options for a QListView/QListWidget.

At the top level, add QTreeWidget or QTreeView will give you the hierarchy you're looking for, as well as managing the scrolling area.

Each Listed Item of the (expanded) QTreeXItem will be a QListView/QListWidget, setting setViewMode(QListView::IconMode) on them.

EDIT:
Note that to get the precise look you wanted above, you'll probably have to use QListView and use a custom delegate, handling the drawing yourself (unless you can find a theme that will do exactly what you want). However, I've coded up a short PyQt solution below using the Q*Widget classes because they're shorter, and will still demonstrate how to get the right layout. If you're using C++, the same Qt function calls apply, but obviously you might have more or less bookkeeping.

import sys
from PyQt4 import QtGui, QtCore

class displayItem(QtGui.QWidget):  #A simple widget to display, just centers a digit in a 100x100 widget
    def __init__(self,num):
        QtGui.QWidget.__init__(self)
        self.size=100
        self.resize(self.size,self.size)
        self.setMinimumSize(self.size,self.size)
        self.text = num
    def paintEvent(self,event):
        p = QtGui.QPainter(self)
        p.drawText(self.size//2,self.size//2,str(self.text))

app = QtGui.QApplication(sys.argv)
widget = QtGui.QTreeWidget()
widget.setWindowTitle('simple tree')

#Build the list widgets
treeItem1 = QtGui.QTreeWidgetItem(widget)
treeItem1.setText(0,"TreeWidget Parent")   #Sets the "header" for your [+] box

list1 = QtGui.QListWidget()                #This will contain your icon list
list1.setMovement(QtGui.QListView.Static)  #otherwise the icons are draggable
list1.setResizeMode(QtGui.QListView.Adjust) #Redo layout every time we resize
list1.setViewMode(QtGui.QListView.IconMode) #Layout left-to-right, not top-to-bottom

listItem = QtGui.QListWidgetItem(list1)
listItem.setSizeHint(QtCore.QSize(100,100)) #Or else the widget items will overlap (irritating bug)
list1.setItemWidget(listItem,displayItem(1))

listItem = QtGui.QListWidgetItem(list1)     #Add a few more items
listItem.setSizeHint(QtCore.QSize(100,100))
list1.setItemWidget(listItem,displayItem(2))

listItem = QtGui.QListWidgetItem(list1)
listItem.setSizeHint(QtCore.QSize(100,100))
list1.setItemWidget(listItem,displayItem(3))

list1.setAutoFillBackground(True)                #Required for a widget that will be a QTreeWidgetItem widget
treeSubItem1 = QtGui.QTreeWidgetItem(treeItem1)  #Make a subitem to hold our list
widget.setItemWidget(treeSubItem1,0,list1)       #Assign this list as a tree item

treeItem2 = QtGui.QTreeWidgetItem(widget)        #Make a fake second parent
treeItem2.setText(0,"TreeWidget Parent II")

widget.show()           #kick off the app in standard PyQt4 fashion
sys.exit(app.exec_())
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