我目前有一个 QScrollArea 定义为:
self.results_grid_scrollarea = QScrollArea()
self.results_grid_widget = QWidget()
self.results_grid_layout = QGridLayout()
self.results_grid_layout.setSizeConstraint(QLayout.SetMinAndMaxSize)
self.results_grid_widget.setLayout(self.results_grid_layout)
self.results_grid_scrollarea.setWidgetResizable(True)
self.results_grid_scrollarea.setWidget(self.results_grid_widget)
self.results_grid_scrollarea.setViewportMargins(0,20,0,0)
它非常高兴地嵌套在其他布局/小部件中,按预期调整大小等。
为了为网格列提供标题,我使用了位于滚动区域正上方的另一个 QGridLayout - 这很有效……但看起来有点奇怪,即使样式设置得当,尤其是当按需(垂直)滚动条出现或消失时根据需要,标题不再与网格列正确对齐。这是我所知道的美学问题……但我有点挑剔;)
self.results_grid_layout
其他小部件以编程方式添加/删除到其他地方。上面的最后一行我最近刚刚添加,因为我认为使用创建的边距区域很容易,setViewportMargins 的文档状态:
设置滚动区域周围的边距。这对于具有“锁定”行和列的电子表格等应用程序很有用。边缘空间留空;将小部件放在未使用的区域。
但是我一辈子都无法弄清楚如何真正实现这一目标,而且我的 GoogleFu 今天已经抛弃了我,或者几乎没有关于如何真正实现这一目标的信息/示例。
我的头脑告诉我,我可以只分配一个小部件,由布局(包含任意数量的其他小部件)控制到滚动区域 - 正如我所做的那样。如果我将 QHeaderview 例如添加到网格布局的第 0 行,它只会出现在视口的边距下方并与布局的其余部分一起滚动?还是我错过了一些东西,只是看不到树木的树木?
我只是在学习 Python/Qt,所以任何帮助、指针和/或示例(最好使用 Python,但不是必需的)将不胜感激!
编辑:遵循到目前为止给出的建议(我认为),我想出了以下小测试程序来尝试一下:
import sys
from PySide.QtCore import *
from PySide.QtGui import *
class MainWindow(QMainWindow):
def __init__(self, parent=None):
super(MainWindow, self).__init__(parent)
self.setMinimumSize(640, 480)
self.container_widget = QWidget()
self.container_layout = QVBoxLayout()
self.container_widget.setLayout(self.container_layout)
self.setCentralWidget(self.container_widget)
self.info_label = QLabel(
"Here you can see the problem.... I hope!\n"
"Once the window is resized everything behaves itself.")
self.info_label.setWordWrap(True)
self.headings_widget = QWidget()
self.headings_layout = QGridLayout()
self.headings_widget.setLayout(self.headings_layout)
self.headings_layout.setContentsMargins(1,1,0,0)
self.heading_label1 = QLabel("Column 1")
self.heading_label1.setContentsMargins(16,0,0,0)
self.heading_label2 = QLabel("Col 2")
self.heading_label2.setAlignment(Qt.AlignCenter)
self.heading_label2.setMaximumWidth(65)
self.heading_label3 = QLabel("Column 3")
self.heading_label3.setContentsMargins(8,0,0,0)
self.headings_layout.addWidget(self.heading_label1,0,0)
self.headings_layout.addWidget(self.heading_label2,0,1)
self.headings_layout.addWidget(self.heading_label3,0,2)
self.headings_widget.setStyleSheet(
"background: green; border-bottom: 1px solid black;" )
self.grid_scrollarea = QScrollArea()
self.grid_widget = QWidget()
self.grid_layout = QGridLayout()
self.grid_layout.setSizeConstraint(QLayout.SetMinAndMaxSize)
self.grid_widget.setLayout(self.grid_layout)
self.grid_scrollarea.setWidgetResizable(True)
self.grid_scrollarea.setWidget(self.grid_widget)
self.grid_scrollarea.setViewportMargins(0,30,0,0)
self.headings_widget.setParent(self.grid_scrollarea)
### Add some linedits to the scrollarea just to test
rows_to_add = 10
## Setting the above to a value greater than will fit in the initial
## window will cause the lineedits added below to display correctly,
## however - using the 10 above, the lineedits do not expand to fill
## the scrollarea's width until you resize the window horizontally.
## What's the best way to fix this odd initial behaviour?
for i in range(rows_to_add):
col1 = QLineEdit()
col2 = QLineEdit()
col2.setMaximumWidth(65)
col3 = QLineEdit()
row = self.grid_layout.rowCount()
self.grid_layout.addWidget(col1,row,0)
self.grid_layout.addWidget(col2,row,1)
self.grid_layout.addWidget(col3,row,2)
### Define Results group to hold the above sections
self.test_group = QGroupBox("Results")
self.test_layout = QVBoxLayout()
self.test_group.setLayout(self.test_layout)
self.test_layout.addWidget(self.info_label)
self.test_layout.addWidget(self.grid_scrollarea)
### Add everything to the main layout
self.container_layout.addWidget(self.test_group)
def resizeEvent(self, event):
scrollarea_vpsize = self.grid_scrollarea.viewport().size()
scrollarea_visible_size = self.grid_scrollarea.rect()
desired_width = scrollarea_vpsize.width()
desired_height = scrollarea_visible_size.height()
desired_height = desired_height - scrollarea_vpsize.height()
new_geom = QRect(0,0,desired_width+1,desired_height-1)
self.headings_widget.setGeometry(new_geom)
def main():
app = QApplication(sys.argv)
form = MainWindow()
form.show()
app.exec_()
if __name__ == '__main__':
main()
沿着这些思路的东西是你所指的方法吗?一切都按预期工作,这正是我所追求的,除了在用户调整窗口大小之前的一些奇怪的初始行为,一旦调整大小,一切都排好了。我可能又想多了,或者至少忽略了一些东西……有什么想法吗?