We now have several scripts that change Leo's layouts. Let's call the
results of those scripts *alternate *layouts.
Those scripts suffice if an outline only uses one layout at a time. But
what if we want to switch between layouts?
- How can we switch between *alternate *layouts?
- How can we revert to Leo's default layout?
After some experimentation, I saw the answer. *Each layout script must
define its own undoer.* There is no other way. This creates the following
(tested) top-level pattern for layout scripts:
"""Change layout to Jacob Peck's quadrants layout."""
from typing import Any
from leo.core.leoQt import Orientation, QtWidgets
h = c.hash()
pc = g.app.pluginsController
@others # Define helpers
undo_layout()
if pc.isLoaded('leo.plugins.viewrendered3'):
import leo.plugins.viewrendered3 as vr3
try:
parent = vr3.controllers[h]
except KeyError:
vr3.controllers[h] = parent = vr3.ViewRenderedController3(c)
switch_layout('vr3-show', parent)
c.layout_undoer = undoer
if pc.isLoaded('leo.plugins.viewrendered'):
import leo.plugins.viewrendered as vr
parent = vr.controllers[h]
switch_layout('vr-show', parent)
c.layout_undoer = undoer
Here is the latest *switch_layout *method:
def switch_layout(cmd: str, parent: Any) -> None:
gui = g.app.gui
def make_splitter():
w = QtWidgets.QSplitter()
w.setObjectName('body_splitter')
return w
ms = gui.find_widget_by_name(c, 'main_splitter')
ss = gui.find_widget_by_name(c, 'secondary_splitter')
edf = gui.find_widget_by_name(c, 'bodyFrame')
# add vertical splitter to ms (hosting only the editor)
body_splitter = make_splitter()
body_splitter.setOrientation(Orientation.Vertical)
ms.addWidget(body_splitter)
body_splitter.addWidget(edf)
if not parent.isVisible():
body_splitter.addWidget(parent)
body_splitter.setSizes([100_000] * len(body_splitter.sizes()))
ms.setSizes([100_000] * len(ms.sizes()))
ss.setSizes([100_000] * len(ss.sizes()))
c.doCommandByName(cmd)
There are two *undo helpers* defined as follows:
def undo_layout():
layout_undoer = getattr(c, 'layout_undoer', None)
if layout_undoer:
layout_undoer(c)
c.layout_undoer = None
def undoer(c):
print('')
print('*** quadrants layout undoer')
print('')
The undoer function shown above is merely a placeholder.
*Summary*
Each layout script must define a bespoke undoer. That's my next task.
Edward
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