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400 lines
9.3 KiB
Python
400 lines
9.3 KiB
Python
# Module 'Buttons'
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# Import module 'rect' renamed as '_rect' to avoid exporting it on
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# 'from Buttons import *'
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#
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import rect
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_rect = rect
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del rect
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# Field indices in mouse event detail
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#
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_HV = 0
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_CLICKS = 1
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_BUTTON = 2
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_MASK = 3
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# LabelAppearance provides defaults for all appearance methods.
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# selected state not visible
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# disabled --> crossed out
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# hilited --> inverted
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#
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class LabelAppearance():
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#
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# Initialization
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#
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def init_appearance(self):
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self.bounds = _rect.empty
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self.enabled = 1
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self.hilited = 0
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self.selected = 0
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self.text = ''
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#
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# Size enquiry
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#
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def minsize(self, m):
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try:
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self.text = self.text
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except NameError:
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self.text = ''
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return m.textwidth(self.text) + 6, m.lineheight() + 6
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#
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def getbounds(self):
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return self.bounds
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#
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# Changing the parameters
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#
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def settext(self, text):
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self.text = text
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if self.bounds <> _rect.empty:
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self.recalctextpos()
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self.redraw()
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#
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def setbounds(self, bounds):
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if self.bounds <> _rect.empty:
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self.parent.change(self.bounds)
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self.bounds = bounds
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if self.bounds <> _rect.empty:
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self.recalc()
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self.parent.change(bounds)
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#
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# Changing the state bits
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#
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def enable(self, flag):
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if flag <> self.enabled:
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self.enabled = flag
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if self.bounds <> _rect.empty:
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self.flipenable(self.parent.begindrawing())
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#
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def hilite(self, flag):
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if flag <> self.hilited:
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self.hilited = flag
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if self.bounds <> _rect.empty:
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self.fliphilite(self.parent.begindrawing())
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#
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def select(self, flag):
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if flag <> self.selected:
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self.selected = flag
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if self.bounds <> _rect.empty:
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self.redraw()
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#
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# Recalculate the box bounds and text position.
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# This can be overridden by buttons that draw different boxes
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# or want their text in a different position.
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#
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def recalc(self):
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if self.bounds <> _rect.empty:
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self.recalcbounds()
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self.recalctextpos()
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#
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def recalcbounds(self):
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self.hilitebounds = _rect.inset(self.bounds, (3, 3))
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self.crossbounds = self.bounds
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#
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def recalctextpos(self):
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(left, top), (right, bottom) = self.bounds
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m = self.parent.beginmeasuring()
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h = (left + right - m.textwidth(self.text)) / 2
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v = (top + bottom - m.lineheight()) / 2
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self.textpos = h, v
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#
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# Generic drawing interface.
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# Do not override redraw() or draw() methods; override drawit() c.s.
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#
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def redraw(self):
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if self.bounds <> _rect.empty:
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self.draw(self.parent.begindrawing(), self.bounds)
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#
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def draw(self, (d, area)):
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area = _rect.intersect(area, self.bounds)
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if area = _rect.empty:
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return
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d.cliprect(area)
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d.erase(self.bounds)
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self.drawit(d)
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d.noclip()
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#
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# The drawit() method is fairly generic but may be overridden.
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#
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def drawit(self, d):
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self.drawpict(d)
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if self.text:
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d.text(self.textpos, self.text)
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if not self.enabled:
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self.flipenable(d)
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if self.hilited:
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self.fliphilite(d)
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#
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# Default drawing detail functions.
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# Overriding these is normally sufficient to get different
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# appearances.
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#
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def drawpict(self, d):
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pass
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#
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def flipenable(self, d):
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_xorcross(d, self.crossbounds)
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#
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def fliphilite(self, d):
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d.invert(self.hilitebounds)
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# ButtonAppearance displays a centered string in a box.
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# selected --> bold border
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# disabled --> crossed out
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# hilited --> inverted
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#
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class ButtonAppearance() = LabelAppearance():
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#
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def drawpict(self, d):
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d.box(_rect.inset(self.bounds, (1, 1)))
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if self.selected:
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# Make a thicker box
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d.box(self.bounds)
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d.box(_rect.inset(self.bounds, (2, 2)))
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d.box(_rect.inset(self.bounds, (3, 3)))
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#
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# CheckAppearance displays a small square box and a left-justified string.
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# selected --> a cross appears in the box
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# disabled --> whole button crossed out
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# hilited --> box is inverted
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#
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class CheckAppearance() = LabelAppearance():
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#
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def minsize(self, m):
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width, height = m.textwidth(self.text) + 6, m.lineheight() + 6
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return width + height + m.textwidth(' '), height
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#
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def drawpict(self, d):
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d.box(self.boxbounds)
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if self.selected: _xorcross(d, self.boxbounds)
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#
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def recalcbounds(self):
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LabelAppearance.recalcbounds(self)
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(left, top), (right, bottom) = self.bounds
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self.size = bottom - top - 4
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self.boxbounds = (left+2, top+2), (left+2+self.size, bottom-2)
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self.hilitebounds = self.boxbounds
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#
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def recalctextpos(self):
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m = self.parent.beginmeasuring()
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(left, top), (right, bottom) = self.boxbounds
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h = right + m.textwidth(' ')
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v = top + (self.size - m.lineheight()) / 2
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self.textpos = h, v
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#
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# RadioAppearance displays a round indicator and a left-justified string.
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# selected --> a dot appears in the indicator
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# disabled --> whole button crossed out
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# hilited --> indicator is inverted
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#
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class RadioAppearance() = CheckAppearance():
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#
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def drawpict(self, d):
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(left, top), (right, bottom) = self.boxbounds
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radius = self.size / 2
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h, v = left + radius, top + radius
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d.circle((h, v), radius)
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if self.selected:
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some = radius/3
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d.paint((h-some, v-some), (h+some, v+some))
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#
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# NoReactivity ignores mouse events.
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#
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class NoReactivity():
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def init_reactivity(self): pass
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# BaseReactivity defines hooks and asks for mouse events,
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# but provides only dummy mouse event handlers.
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# The trigger methods call the corresponding hooks set by the user.
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# Hooks (and triggers) mean the following:
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# down_hook called on some mouse-down events
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# move_hook called on some mouse-move events
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# up_hook called on mouse-up events
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# on_hook called for buttons with on/off state, when it goes on
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# hook called when a button 'fires' or a radiobutton goes on
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# There are usually extra conditions, e.g., hooks are only called
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# when the button is enabled, or active, or selected (on).
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#
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class BaseReactivity():
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#
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def init_reactivity(self):
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self.down_hook = self.move_hook = self.up_hook = \
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self.on_hook = self.off_hook = \
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self.hook = self.active = 0
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self.parent.need_mouse(self)
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#
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def mousetest(self, hv):
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return _rect.pointinrect(hv, self.bounds)
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#
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def mouse_down(self, detail):
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pass
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#
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def mouse_move(self, detail):
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pass
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#
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def mouse_up(self, detail):
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pass
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#
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def down_trigger(self):
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if self.down_hook: self.down_hook(self)
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#
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def move_trigger(self):
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if self.move_hook: self.move_hook(self)
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#
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def up_trigger(self):
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if self.up_hook: self.up_hook(self)
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#
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def on_trigger(self):
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if self.on_hook: self.on_hook(self)
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#
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def off_trigger(self):
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if self.off_hook: self.off_hook(self)
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#
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def trigger(self):
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if self.hook: self.hook(self)
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# ToggleReactivity acts like a simple pushbutton.
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# It toggles its hilite state on mouse down events.
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#
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class ToggleReactivity() = BaseReactivity():
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#
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def mouse_down(self, detail):
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if self.enabled and self.mousetest(detail[_HV]):
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self.active = 1
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self.hilite(not self.hilited)
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self.down_trigger()
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#
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def mouse_move(self, detail):
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if self.active:
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self.move_trigger()
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#
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def mouse_up(self, detail):
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if self.active:
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self.up_trigger()
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self.active = 0
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#
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def down_trigger(self):
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if self.hilited:
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self.on_trigger()
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else:
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self.off_trigger()
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self.trigger()
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#
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# TriggerReactivity acts like a fancy pushbutton.
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# It hilites itself while the mouse is down within its bounds.
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#
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class TriggerReactivity() = BaseReactivity():
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#
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def mouse_down(self, detail):
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if self.enabled and self.mousetest(detail[_HV]):
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self.active = 1
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self.hilite(1)
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self.down_trigger()
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#
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def mouse_move(self, detail):
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if self.active:
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self.hilite(self.mousetest(detail[_HV]))
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if self.hilited:
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self.move_trigger()
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#
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def mouse_up(self, detail):
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if self.active:
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self.hilite(self.mousetest(detail[_HV]))
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if self.hilited:
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self.up_trigger()
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self.trigger()
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self.active = 0
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self.hilite(0)
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#
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# CheckReactivity handles mouse events like TriggerReactivity,
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# It overrides the up_trigger method to flip its selected state.
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#
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class CheckReactivity() = TriggerReactivity():
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#
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def up_trigger(self):
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self.select(not self.selected)
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if self.selected:
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self.on_trigger()
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else:
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self.off_trigger()
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self.trigger()
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# RadioReactivity turns itself on and the other buttons in its group
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# off when its up_trigger method is called.
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#
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class RadioReactivity() = TriggerReactivity():
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#
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def init_reactivity(self):
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TriggerReactivity.init_reactivity(self)
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self.group = []
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#
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def up_trigger(self):
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for b in self.group:
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if b <> self:
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if b.selected:
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b.select(0)
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b.off_trigger()
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self.select(1)
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self.on_trigger()
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self.trigger()
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# Auxiliary class for 'define' method.
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# Call the initializers in the right order.
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#
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class Define():
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#
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def define(self, parent):
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self.parent = parent
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parent.addchild(self)
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self.init_appearance()
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self.init_reactivity()
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return self
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#
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def destroy(self):
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self.parent = 0
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#
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def definetext(self, (parent, text)):
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self = self.define(parent)
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self.settext(text)
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return self
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# Subroutine to cross out a rectangle.
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#
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def _xorcross(d, bounds):
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((left, top), (right, bottom)) = bounds
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# This is s bit funny to make it look better
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left = left + 2
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right = right - 2
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top = top + 2
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bottom = bottom - 3
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d.xorline(((left, top), (right, bottom)))
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d.xorline((left, bottom), (right, top))
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# Ready-made button classes.
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#
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class Label() = NoReactivity(), LabelAppearance(), Define(): pass
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class PushButton() = TriggerReactivity(), ButtonAppearance(), Define(): pass
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class CheckButton() = CheckReactivity(), CheckAppearance(), Define(): pass
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class RadioButton() = RadioReactivity(), RadioAppearance(), Define(): pass
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class ToggleButton() = ToggleReactivity(), ButtonAppearance(), Define(): pass
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