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TextBox improvements. #17117

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Merged
merged 1 commit into from
Apr 15, 2020
Merged

TextBox improvements. #17117

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18 changes: 11 additions & 7 deletions examples/widgets/textbox.py
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Original file line number Diff line number Diff line change
Expand Up @@ -16,12 +16,13 @@
import numpy as np
import matplotlib.pyplot as plt
from matplotlib.widgets import TextBox


fig, ax = plt.subplots()
plt.subplots_adjust(bottom=0.2)
fig.subplots_adjust(bottom=0.2)

t = np.arange(-2.0, 2.0, 0.001)
s = t ** 2
initial_text = "t ** 2"
l, = plt.plot(t, s, lw=2) # make a plot for the math expression "t ** 2"
l, = ax.plot(t, np.zeros_like(t), lw=2)


def submit(expression):
Expand All @@ -33,12 +34,15 @@ def submit(expression):
"""
ydata = eval(expression)
l.set_ydata(ydata)
ax.set_ylim(np.min(ydata), np.max(ydata))
ax.relim()
ax.autoscale_view()
plt.draw()

axbox = plt.axes([0.1, 0.05, 0.8, 0.075])
text_box = TextBox(axbox, 'Evaluate', initial=initial_text)

axbox = fig.add_axes([0.1, 0.05, 0.8, 0.075])
text_box = TextBox(axbox, "Evaluate")
text_box.on_submit(submit)
text_box.set_val("t ** 2") # Trigger `submit` with the initial string.

plt.show()

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6 changes: 6 additions & 0 deletions lib/matplotlib/widgets.py
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Original file line number Diff line number Diff line change
Expand Up @@ -767,6 +767,12 @@ def _rendercursor(self):
# and save its dimensions, draw the real text, then put the cursor
# at the saved dimensions

# This causes a single extra draw if the figure has never been rendered
# yet, which should be fine as we're going to repeatedly re-render the
# figure later anyways.
if self.ax.figure._cachedRenderer is None:
self.ax.figure.canvas.draw()

text = self.text_disp.get_text() # Save value before overwriting it.
widthtext = text[:self.cursor_index]
self.text_disp.set_text(widthtext or ",")
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