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187 lines
6.4 KiB
187 lines
6.4 KiB
3 years ago
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"""Tools for displaying tool-tips.
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This includes:
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* an abstract base-class for different kinds of tooltips
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* a simple text-only Tooltip class
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"""
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from tkinter import *
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class TooltipBase:
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"""abstract base class for tooltips"""
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def __init__(self, anchor_widget):
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"""Create a tooltip.
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anchor_widget: the widget next to which the tooltip will be shown
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Note that a widget will only be shown when showtip() is called.
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"""
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self.anchor_widget = anchor_widget
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self.tipwindow = None
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def __del__(self):
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self.hidetip()
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def showtip(self):
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"""display the tooltip"""
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if self.tipwindow:
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return
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self.tipwindow = tw = Toplevel(self.anchor_widget)
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# show no border on the top level window
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tw.wm_overrideredirect(1)
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try:
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# This command is only needed and available on Tk >= 8.4.0 for OSX.
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# Without it, call tips intrude on the typing process by grabbing
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# the focus.
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tw.tk.call("::tk::unsupported::MacWindowStyle", "style", tw._w,
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"help", "noActivates")
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except TclError:
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pass
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self.position_window()
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self.showcontents()
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self.tipwindow.update_idletasks() # Needed on MacOS -- see #34275.
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self.tipwindow.lift() # work around bug in Tk 8.5.18+ (issue #24570)
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def position_window(self):
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"""(re)-set the tooltip's screen position"""
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x, y = self.get_position()
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root_x = self.anchor_widget.winfo_rootx() + x
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root_y = self.anchor_widget.winfo_rooty() + y
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self.tipwindow.wm_geometry("+%d+%d" % (root_x, root_y))
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def get_position(self):
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"""choose a screen position for the tooltip"""
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# The tip window must be completely outside the anchor widget;
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# otherwise when the mouse enters the tip window we get
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# a leave event and it disappears, and then we get an enter
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# event and it reappears, and so on forever :-(
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#
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# Note: This is a simplistic implementation; sub-classes will likely
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# want to override this.
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return 20, self.anchor_widget.winfo_height() + 1
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def showcontents(self):
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"""content display hook for sub-classes"""
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# See ToolTip for an example
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raise NotImplementedError
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def hidetip(self):
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"""hide the tooltip"""
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# Note: This is called by __del__, so careful when overriding/extending
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tw = self.tipwindow
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self.tipwindow = None
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if tw:
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try:
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tw.destroy()
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except TclError: # pragma: no cover
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pass
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class OnHoverTooltipBase(TooltipBase):
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"""abstract base class for tooltips, with delayed on-hover display"""
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def __init__(self, anchor_widget, hover_delay=1000):
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"""Create a tooltip with a mouse hover delay.
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anchor_widget: the widget next to which the tooltip will be shown
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hover_delay: time to delay before showing the tooltip, in milliseconds
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Note that a widget will only be shown when showtip() is called,
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e.g. after hovering over the anchor widget with the mouse for enough
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time.
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"""
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super(OnHoverTooltipBase, self).__init__(anchor_widget)
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self.hover_delay = hover_delay
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self._after_id = None
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self._id1 = self.anchor_widget.bind("<Enter>", self._show_event)
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self._id2 = self.anchor_widget.bind("<Leave>", self._hide_event)
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self._id3 = self.anchor_widget.bind("<Button>", self._hide_event)
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def __del__(self):
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try:
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self.anchor_widget.unbind("<Enter>", self._id1)
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self.anchor_widget.unbind("<Leave>", self._id2) # pragma: no cover
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self.anchor_widget.unbind("<Button>", self._id3) # pragma: no cover
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except TclError:
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pass
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super(OnHoverTooltipBase, self).__del__()
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def _show_event(self, event=None):
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"""event handler to display the tooltip"""
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if self.hover_delay:
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self.schedule()
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else:
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self.showtip()
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def _hide_event(self, event=None):
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"""event handler to hide the tooltip"""
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self.hidetip()
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def schedule(self):
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"""schedule the future display of the tooltip"""
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self.unschedule()
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self._after_id = self.anchor_widget.after(self.hover_delay,
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self.showtip)
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def unschedule(self):
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"""cancel the future display of the tooltip"""
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after_id = self._after_id
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self._after_id = None
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if after_id:
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self.anchor_widget.after_cancel(after_id)
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def hidetip(self):
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"""hide the tooltip"""
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try:
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self.unschedule()
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except TclError: # pragma: no cover
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pass
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super(OnHoverTooltipBase, self).hidetip()
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class Hovertip(OnHoverTooltipBase):
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"A tooltip that pops up when a mouse hovers over an anchor widget."
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def __init__(self, anchor_widget, text, hover_delay=1000):
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"""Create a text tooltip with a mouse hover delay.
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anchor_widget: the widget next to which the tooltip will be shown
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hover_delay: time to delay before showing the tooltip, in milliseconds
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Note that a widget will only be shown when showtip() is called,
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e.g. after hovering over the anchor widget with the mouse for enough
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time.
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"""
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super(Hovertip, self).__init__(anchor_widget, hover_delay=hover_delay)
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self.text = text
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def showcontents(self):
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label = Label(self.tipwindow, text=self.text, justify=LEFT,
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background="#ffffe0", relief=SOLID, borderwidth=1)
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label.pack()
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def _tooltip(parent): # htest #
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top = Toplevel(parent)
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top.title("Test tooltip")
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x, y = map(int, parent.geometry().split('+')[1:])
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top.geometry("+%d+%d" % (x, y + 150))
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label = Label(top, text="Place your mouse over buttons")
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label.pack()
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button1 = Button(top, text="Button 1 -- 1/2 second hover delay")
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button1.pack()
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Hovertip(button1, "This is tooltip text for button1.", hover_delay=500)
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button2 = Button(top, text="Button 2 -- no hover delay")
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button2.pack()
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Hovertip(button2, "This is tooltip\ntext for button2.", hover_delay=None)
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if __name__ == '__main__':
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from unittest import main
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main('idlelib.idle_test.test_tooltip', verbosity=2, exit=False)
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from idlelib.idle_test.htest import run
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run(_tooltip)
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