Note
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12.1.10.10.3. Dynamic form layoutΒΆ
Example for dynamically changing the content of a form layout.
This example shows how new widgets are added or inserted to a form layout in an user interface, how entire rows are removed or how the existing widgets in a form layout are requested.
Most functions used in this example are based on special methods
of the form layout (Qt class: QFormLayout
), that are made accessible
in itom via the uiItem.call('methodName', *args)
method.
from itomUi import ItomUi
from itom import ui
from itom import uiItem
class DynamicFormLayout(ItomUi):
"""Main class with the functionality of the user interface."""
def __init__(self):
"""Constructor."""
# call constructor of ItomUi like it would be the constructor of the class itom.ui:
ItomUi.__init__(self, "dynamicFormLayout.ui", ui.TYPEWINDOW)
# the spacing between each item of the layout is a property
self.layout["spacing"] = 7
self.gui.comboAddWidget.call("addItems", ui.availableWidgets())
self._update()
@property
def layout(self):
"""The reference to the form layout."""
return self.gui.formLayout
@property
def rowCount(self):
"""Returns number of rows in the form layout."""
return self.layout.call("rowCount")
@ItomUi.autoslot("")
def on_btnAddRowLineEdit_clicked(self):
"""Adds a new row with a string label and
a line edit widget (class name in Qt: QLineEdit."""
num = self.rowCount
name = f"LineEdit_{num+1}"
objName = name
self.layout.call("addRow", name, "QLineEdit", objName)
self._update()
@ItomUi.autoslot("")
def on_btnAddRowCheckBox_clicked(self):
"""Adds a new row with a string label and
a line edit widget (class name in Qt: QCheckBox."""
num = self.rowCount
name = f"CheckBox_{num+1}"
objName = name
box = self.layout.call("addRow", name, "QCheckBox", objName)
box["checked"] = True
self._update()
@ItomUi.autoslot("")
def on_btnInsertRowComboBox_clicked(self):
row, valid = ui.getInt(
"Row index",
"At which row should the combo box be inserted?",
0,
parent=self.gui,
)
if valid:
name = f"ComboBox_{self.rowCount+1}"
objName = name
combo = self.layout.call("insertRow", row, name, "QComboBox", objName)
combo.call("addItems", ("Option 1", "Option 2", "Option 3"))
self._update()
@ItomUi.autoslot("")
def on_btnSetWidget_clicked(self):
rowIndex = self.gui.spinAddRowIndex["value"]
# 0: modify label, 1: modify field, 2: widget spans both columns
role = self.gui.comboAddRole["currentIndex"]
className = self.gui.comboAddWidget["currentText"]
self.layout.call("setItem", rowIndex, role, className, f"item_{rowIndex}_{role}")
self._update()
@ItomUi.autoslot("")
def on_btnRemoveRow_clicked(self):
row, valid = ui.getInt(
"Row index",
"Which row index should be removed?",
0,
min=0,
max=self.rowCount - 1,
parent=self.gui,
)
if valid:
self.layout.call("removeRow", row)
self._update()
@ItomUi.autoslot("")
def on_btnInfo_clicked(self):
items = []
label: uiItem
field: uiItem
for r in range(self.rowCount):
try:
label = self.layout.call("itemAtPosition", r, 0) # 0 stands for label
className = label.getClassName()
if className == "QLabel":
lblStr = label["text"]
else:
lblStr = str(label)
except RuntimeError:
lblStr = "<no label>"
try:
field = self.layout.call("itemAtPosition", r, 1) # 1 stands for field
className = field.getClassName()
if className == "QLineEdit":
fieldStr = field["text"]
elif className == "QCheckBox":
fieldStr = "Check Box"
elif className == "QComboBox":
fieldStr = field["currentText"]
else:
fieldStr = str(field)
except RuntimeError:
fieldStr = "<no field>"
items.append(f"{r + 1}: {lblStr}: {fieldStr}")
text = (
f"Form Layout with {self.rowCount} rows:\n"
+ "-----------------------------------------\n\n"
+ "\n".join(items)
)
ui.msgInformation("Info", text, parent=self.gui)
def _update(self):
self.gui.btnRemoveRow["enabled"] = self.rowCount > 0
self.gui.lblCaption["text"] = f"Form Layout (Currently {self.rowCount} rows):"
if __name__ == "__main__":
# create an object of DynamicFormLayout and shows it
win1 = DynamicFormLayout()
win1.gui.show()
![../../../_images/demoDynamicFormLayout_1.png](../../../_images/demoDynamicFormLayout_1.png)
Total running time of the script: ( 0 minutes 0.868 seconds)