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907 | class FluSlider(FluSliderCanvas, DDrawWidget):
def __init__(
self,
*args,
text="",
width=70,
height=28,
orient="horizontal",
tick=False, # 自动吸附
font=None,
mode="light",
state="normal",
value=20,
max=100,
min=0,
step=1,
changed=None,
command=None,
**kwargs,
):
"""构造滑块。
:param args: 透传给 :class:`tkinter.Canvas.__init__`
:param width: 默认宽度
:param height: 默认高度
:param orient: ``"horizontal"`` / ``"vertical"``
:param tick: 是否把取值吸附到整数
:param font: 预留的字体参数(滑块当前不绘制文字)
:param mode: ``"light"`` / ``"dark"``
:param state: ``"normal"`` / ``"disabled"``
:param value: 初始值(会被夹到 ``[min, max]``)
:param max: 最大值
:param min: 最小值
:param step: 键盘方向键每次调整的幅度
:param changed: 值变化回调,尽量以 ``(value,)`` 调用
:param command: ``changed`` 的同义参数(Tk ``Scale`` 的叫法)
:param kwargs: 其余参数透传给 :class:`tkinter.Canvas.__init__`
:raises ValueError: ``orient`` 无法识别
.. note::
历史上 ``command`` 只写在属性表里、构造函数并不接收它,
于是 ``FluSlider(command=cb)`` 会把 ``-command`` 透给
:class:`tkinter.Canvas` 并抛 ``TclError: unknown option "-command"``。
现在两个名字都接受。
"""
if str(orient).lower() not in ORIENTS:
raise ValueError(f"未知的方向 {orient!r};应为 {list(ORIENTS)} 之一")
self._init(mode)
self.dconfigure(
state=state or "normal",
value=value,
max=max,
min=min,
orient=str(orient).lower(),
tick=tick,
step=step,
changed=changed,
command=command,
)
# 初始值也要夹进区间:`_ratio()` 画图时会夹,但属性里留着 200
# 这种越界值会让 `get()` 与画面对不上(也会顺着 changed 回调传出去)。
self.attributes.value = self._clamp_value(value)
# 这些状态位必须在 super().__init__() 之前就位:基类的构造函数里
# 会立刻调用一次 self._draw(),而 _draw 会读它们。
self.enter_thumb = False
#: 上一次排队的"拖动重绘" after id(用于合并连发的 <B1-Motion>)
self._motion_after = None
#: 按下瞬间的值,用于判断松开时要不要触发回调
self._value_on_press = None
#: 本帧把手的位置(命中测试用)
self._thumb_box = None
#: 已渲染把手对应的"样式键",一样就只挪位置、不重新渲染
self._thumb_key = None
super().__init__(*args, width=width, height=height, **kwargs)
self.bind("<<Clicked>>", lambda event=None: self.focus_set(), add="+")
self.bind("<B1-Motion>", self._event_button1_motion, add="+")
self.bind("<Motion>", self._event_motion, add="+")
self.configure(takefocus=1)
horizontal = self.attributes.orient == "horizontal"
self.bind(
"<Right>" if horizontal else "<Down>",
lambda event=None: self.step_by(+1),
add="+",
)
self.bind(
"<Left>" if horizontal else "<Up>",
lambda event=None: self.step_by(-1),
add="+",
)
self.bind("<Home>", lambda event=None: self.set(self.attributes.min), add="+")
self.bind("<End>", lambda event=None: self.set(self.attributes.max), add="+")
from .defs import set_default_font
set_default_font(font, self.attributes, master=self)
# ------------------------------------------------------------------
# 初始化
# ------------------------------------------------------------------
def _init(self, mode):
from easydict import EasyDict
self.attributes = EasyDict(
{
"command": None,
"state": "normal",
"orient": "horizontal",
"tick": False,
"step": 1,
"changed": None,
"value": 20,
"max": 100,
"min": 0,
"rest": {},
"hover": {},
"pressed": {},
"disabled": {},
}
)
self.theme(mode)
# ------------------------------------------------------------------
# 取值
# ------------------------------------------------------------------
def _range(self):
"""返回排好序的 ``(最小值, 最大值)``。
``min`` / ``max`` 写反了也照样能用——直接对调,而不是画出反的滑块。
"""
low = float(self.attributes.min)
high = float(self.attributes.max)
return (low, high) if low <= high else (high, low)
def _clamp_value(self, value):
"""把取值夹进区间(``tick`` 打开时顺带吸附到整数)。"""
low, high = self._range()
try:
number = float(value)
except (TypeError, ValueError):
number = low
if self.attributes.tick:
number = round(number)
return max(low, min(high, number))
def _ratio(self):
"""当前值在区间里的比例(``0``–``1``)。"""
low, high = self._range()
span = high - low
if span <= 0:
return 0.0
return (self._clamp_value(self.attributes.value) - low) / span
def get(self):
"""取当前值(保证落在 ``[min, max]`` 之内)。"""
return self._clamp_value(self.attributes.value)
def set(self, value, redraw: bool = True, notify: bool = False):
"""设置当前值(自动夹到区间内)。
:param value: 新值
:param redraw: 是否立即重绘,默认 ``True``
:param notify: 是否触发 ``changed`` / ``command``,默认 ``False``
:returns: 值是否真的改变了
"""
clamped = self._clamp_value(value)
changed = self._value_differs(clamped, self.attributes.value)
self.attributes.value = clamped
if redraw:
self._draw()
if notify and changed:
self._emit_changed()
return changed
def step_by(self, direction: int):
"""按 ``step`` 调整值(键盘方向键用)。
:param direction: ``+1`` 增大、``-1`` 减小
"""
if self.attributes.state == "disabled":
return
try:
step = abs(float(self.attributes.step)) or 1.0
except (TypeError, ValueError):
step = 1.0
if self.set(self.attributes.value + direction * step, notify=True):
self.focus_set()
def _value_differs(self, a, b):
"""两个取值是否不同(容忍 int/float 混用与非法值)。"""
try:
return float(a) != float(b)
except (TypeError, ValueError):
return a is not b
def _emit_changed(self):
"""触发 ``changed`` / ``command``(两个名字等价)。"""
from .defs import call_command
call_command(self.attributes.changed, self.attributes.value)
call_command(self.attributes.command, self.attributes.value)
# ------------------------------------------------------------------
# 配色
# ------------------------------------------------------------------
def _palette(self):
"""按当前交互状态挑一组配色。
.. note::
旧实现写成 ``if event:`` —— 只有"带事件的调用"才会进入
hover/pressed 分支,而拖动路径最后调的是不带事件的 ``_draw()``,
于是**拖动手感永远是 rest**(把手不会变大、内圆也不会缩)。
这里改成只看状态位 ``button1`` / ``enter``,与事件无关。
"""
if self.attributes.state != "normal":
return "disabled", self.attributes.disabled
if self.button1:
return "pressed", self.attributes.pressed
if self.enter:
return "hover", self.attributes.hover
return "rest", self.attributes.rest
def _draw(self, event=None):
"""重新绘制组件。"""
super()._draw(event)
self.delete("track")
state_name, _dict = self._palette()
_radius = _dict.radius
_track_height = _dict.track.width
_track_back_color = _dict.track.back_color
_track_back_opacity = _dict.track.back_opacity
_rail_back_color = _dict.rail.back_color
_rail_back_opacity = _dict.rail.back_opacity
_thumb_radius = _dict.thumb.radius
_thumb_inner_radius = _dict.thumb.inner_radius
_thumb_width = _dict.thumb.width
_thumb_back_color = _dict.thumb.back_color
_thumb_back_opacity = _dict.thumb.back_opacity
_thumb_border_color = _dict.thumb.border_color
_thumb_border_color_opacity = _dict.thumb.border_color_opacity
_thumb_border_color2 = _dict.thumb.border_color2
_thumb_border_color2_opacity = _dict.thumb.border_color2_opacity
_thumb_inner_back_color = _dict.thumb.inner_back_color
_thumb_inner_back_opacity = _dict.thumb.inner_back_opacity
width = self.winfo_width()
height = self.winfo_height()
if width <= 1 or height <= 1:
return # 布局还没完成,画出来只会更难看的
from .designs.renderer import get_renderer
is_wand = get_renderer() == 1
ratio = self._ratio()
center_x, center_y, progress = self._thumb_geometry(width, height, _thumb_width, ratio)
self._draw_track(
width,
height,
progress,
_thumb_width,
_track_height,
_radius,
_track_back_color,
_track_back_opacity,
_rail_back_color,
_rail_back_opacity,
is_wand,
)
self._draw_thumb(
center_x,
center_y,
_thumb_width,
_thumb_radius,
_thumb_inner_radius,
_thumb_back_color,
_thumb_back_opacity,
_thumb_border_color,
_thumb_border_color_opacity,
_thumb_border_color2,
_thumb_border_color2_opacity,
_thumb_inner_back_color,
_thumb_inner_back_opacity,
state_name,
is_wand,
)
# ------------------------------------------------------------------
# 几何
# ------------------------------------------------------------------
def _thumb_geometry(self, width, height, thumb_size, ratio):
"""算出把手的**中心点**与"进度终点"。
:returns: ``(center_x, center_y, progress)``,``progress`` 是进度条
应当画到的位置(横向是 x,纵向是 y)
"""
if self.attributes.orient == "vertical":
span = max(1.0, height - thumb_size)
progress = thumb_size / 2 + ratio * span
return width / 2, progress, progress
span = max(1.0, width - thumb_size)
progress = thumb_size / 2 + ratio * span
return progress, height / 2, progress
def _thumb_render_size(self):
"""把手位图的**实际**像素尺寸。
SVG 引擎(tksvg / wand)会按内容的包围盒出图:一个"28px 的圆"实际
只有 24px(圆心在 14、半径 12)。若仍按 28 去摆放,把手就会偏左
2px,与鼠标位置对不上。栅格引擎返回的正是请求的尺寸。
这里量一次、记住,之后按真实尺寸居中。
"""
item = getattr(self, "element_thumb", None)
photo = self._photo_refs.get(item) if item is not None else None
if photo is None:
return None
try:
return (photo.width(), photo.height())
except Exception:
return None
def _draw_track(
self,
width,
height,
center,
thumb_size,
track_height,
radius,
track_color,
track_opacity,
rail_color,
rail_opacity,
is_wand,
):
"""画进度条槽。"""
if self.attributes.orient == "vertical":
# tkdeft 的 create_track 只会画横向的槽,纵向用两个圆角矩形拼:
# 上段是已选中部分,下段是底轨。这样五个引擎的画面完全一致。
thickness = track_height
x = width / 2 - thickness / 2
y1 = thumb_size / 4
y2 = height - thumb_size / 2
split = min(max(center, y1), y2)
self.element_rail = self.draw_roundrect(
x,
y1,
x + thickness,
y2,
radius,
temppath=self.temppath,
temppath2=self.temppath3,
fill=rail_color,
fill_opacity=rail_opacity,
outline=None,
outline_opacity=0.0,
width=0,
)
self.element_track = self.draw_roundrect(
x,
y1,
x + thickness,
max(split, y1 + thickness),
radius,
temppath=self.temppath2,
temppath2=self.temppath4,
fill=track_color,
fill_opacity=track_opacity,
outline=None,
outline_opacity=0.0,
width=0,
)
return
track_x1 = thumb_size / 4
track_x2 = width - thumb_size / 2
track_y = height / 2 - track_height / 2
if is_wand:
# wand 引擎在位图边缘会多算一个像素,历史组件都按这个约定补偿
track_x2 -= 0.5
track_height = max(1, track_height - 1)
track_length = max(1.0, track_x2 - track_x1)
filled = min(max(center - thumb_size / 4, 0.0), track_length)
self.element_track = self.create_track(
track_x1,
track_y,
track_x2,
track_height,
filled,
temppath=self.temppath,
temppath2=self.temppath3,
radius=radius,
track_fill=track_color,
track_opacity=track_opacity,
rail_fill=rail_color,
rail_opacity=rail_opacity,
)
def _draw_thumb(
self,
center_x,
center_y,
thumb_size,
r1,
r2,
fill,
fill_opacity,
border,
border_opacity,
border2,
border2_opacity,
inner_fill,
inner_opacity,
state_name,
is_wand,
):
"""画圆形把手。
把手位图只跟**样式与尺寸**有关,与位置无关。拖动时位置一直在变、
样式却不变,所以这里记下"样式键":键没变就只把已有图元挪过去
(``coords``,实测 0.01ms),不再走一遍"生成 SVG → 解析 → 出图"
(默认 tksvg 下约 8ms)。
位置按**位图真实尺寸**居中:SVG 引擎出的是内容包围盒(28px 的圆
实际 24px),按请求尺寸摆放会整体偏 2px。
"""
size = thumb_size - 3.5 if is_wand else thumb_size
key = (
state_name,
round(size, 2),
r1,
r2,
fill,
fill_opacity,
border,
border_opacity,
border2,
border2_opacity,
inner_fill,
inner_opacity,
)
existing = getattr(self, "element_thumb", None)
if existing is not None and self._thumb_key == key:
actual = self._thumb_render_size()
if actual is not None:
self._place_thumb(existing, center_x, center_y, actual)
return
self.delete("thumb")
self.element_thumb = self.create_thumb(
center_x - size / 2,
center_y - size / 2,
size,
size,
r1,
r2,
temppath=self.temppath2,
temppath2=self.temppath4,
fill=fill,
fill_opacity=fill_opacity,
outline=border,
outline_opacity=border_opacity,
outline2=border2,
outline2_opacity=border2_opacity,
inner_fill=inner_fill,
inner_fill_opacity=inner_opacity,
)
try:
self.itemconfigure(self.element_thumb, tags="thumb")
except Exception:
pass
self._thumb_key = key
actual = self._thumb_render_size() or (size, size)
self._place_thumb(self.element_thumb, center_x, center_y, actual)
def _place_thumb(self, item, center_x, center_y, size):
"""把把手挪到以 ``(center_x, center_y)`` 为中心的位置,并记录命中框。"""
width, height = size
left = center_x - width / 2.0
top = center_y - height / 2.0
try:
self.coords(item, left, top)
except Exception:
return
self._thumb_box = (left, top, left + width, top + height)
self.tag_raise(item)
# ------------------------------------------------------------------
# 交互
# ------------------------------------------------------------------
def pos(self, event):
"""按鼠标位置更新滑块的值(并重绘)。
:param event: 鼠标事件;**缺失时直接返回**——``_event_on_button1()``
这类钩子的签名是 ``event=None``,程序化调用(例如 ``python -m tkflu
--check`` 的自检)不会带事件,这里不能去读 ``event.x``。
"""
if event is None:
return
if self.attributes.state != "normal":
return
thumb_size = self.attributes.pressed.thumb.width
if self.attributes.orient == "vertical":
position = event.y
extent = self.winfo_height()
else:
position = event.x
extent = self.winfo_width()
# 分母必须至少是 1:滑块比把手还窄时 (extent - thumb_size) 是负数,
# 比例会整体反号,往右拖反而变小。
span = max(1.0, extent - thumb_size)
ratio = (position - thumb_size / 2) / span
ratio = max(0.0, min(1.0, ratio))
low, high = self._range()
self.set(low + ratio * (high - low), redraw=True)
def _event_on_button1(self, event=None):
if self.attributes.state != "normal":
return
self.focus_set()
self._value_on_press = self.attributes.value
super()._event_on_button1(event=event)
self.pos(event)
def _event_off_button1(self, event=None):
# 只有"值真的变了"才回调:原地按一下不该触发 changed
if self._value_on_press is not None and self._value_differs(
self.attributes.value, self._value_on_press
):
self._emit_changed()
self._value_on_press = None
super()._event_off_button1(event=event)
def _event_button1_motion(self, event):
"""拖动:合并连发的移动事件,一个空闲周期只重绘一次。
每次重绘都要重新渲染轨道(默认 tksvg 下约 8ms),鼠标快速划过时
一次拖动能堆出上百个 ``<B1-Motion>``;不合并的话界面会明显发滞。
"""
if event is None:
return
self._pending_motion = event
if self._motion_after is None:
self._motion_after = self.after_idle(self._flush_motion)
def _flush_motion(self):
"""把攒下来的最后一次移动事件真正应用掉。"""
self._motion_after = None
event = getattr(self, "_pending_motion", None)
self._pending_motion = None
if event is None:
return
try:
if not self.winfo_exists():
return
except Exception:
return
self.pos(event)
def _event_motion(self, event=None):
"""鼠标移动:判断是否悬停在把手上(只有状态变了才重绘)。
旧实现用 ``tag_bind`` 绑在把手图元上,但取消绑定那行绑错了对象
(``tag_unbind(self.element_track, ...)``),而且拖动时把手会被整体
重画,绑定关系并不牢靠。这里改成按几何判定,不依赖图元绑定。
"""
inside = self._point_in_thumb(event)
if inside != self.enter_thumb:
self.enter_thumb = inside
self._draw()
def _point_in_thumb(self, event):
"""坐标是否落在把手上。"""
box = getattr(self, "_thumb_box", None)
if box is None or event is None:
return False
return box[0] <= event.x <= box[2] and box[1] <= event.y <= box[3]
def _event_leave(self, event=None):
"""鼠标离开 → 清掉"悬停在把手上"的标记。"""
self.enter_thumb = False
super()._event_leave(event)
# ------------------------------------------------------------------
# 主题
# ------------------------------------------------------------------
def theme(self, mode=None, style=None):
"""切换主题。
:param mode: ``"light"`` / ``"dark"``;省略或传空表示沿用当前值
:param style: 滑块没有样式之分,接受但忽略(与其它组件签名保持一致)
"""
# `self.mode` 在 `_init` 里还不存在(theme 就是在那里被调用的),
# 所以这里必须用 getattr 兜底,否则 FluSlider(mode="") 会抛
# AttributeError: 'FluSlider' object has no attribute 'mode'。
resolved = mode or getattr(self, "mode", None) or "light"
self.mode = resolved
if str(resolved).lower() == "dark":
self._dark()
else:
self._light()
self._thumb_key = None # 配色变了,把手必须重渲染
def _theme(self, mode):
r = slider(mode, "rest")
h = slider(mode, "hover")
p = slider(mode, "pressed")
d = slider(mode, "disabled")
self.dconfigure(
rest={
"radius": r["radius"],
"thumb": {
"radius": r["thumb"]["radius"],
"inner_radius": r["thumb"]["inner_radius"],
"width": r["thumb"]["width"],
"back_color": r["thumb"]["back_color"],
"back_opacity": r["thumb"]["back_opacity"],
"border_color": r["thumb"]["border_color"],
"border_color_opacity": r["thumb"]["border_color_opacity"],
"border_color2": r["thumb"]["border_color2"],
"border_color2_opacity": r["thumb"]["border_color2_opacity"],
"inner_back_color": r["thumb"]["inner_back_color"],
"inner_back_opacity": r["thumb"]["inner_back_opacity"],
},
"track": {
"back_color": r["track"]["back_color"],
"back_opacity": r["track"]["back_opacity"],
"width": r["track"]["width"],
},
"rail": {
"back_color": r["rail"]["back_color"],
"back_opacity": r["rail"]["back_opacity"],
},
},
hover={
"radius": h["radius"],
"thumb": {
"radius": h["thumb"]["radius"],
"inner_radius": h["thumb"]["inner_radius"],
"width": r["thumb"]["width"],
"back_color": h["thumb"]["back_color"],
"back_opacity": h["thumb"]["back_opacity"],
"border_color": h["thumb"]["border_color"],
"border_color_opacity": h["thumb"]["border_color_opacity"],
"border_color2": h["thumb"]["border_color2"],
"border_color2_opacity": h["thumb"]["border_color2_opacity"],
"inner_back_color": h["thumb"]["inner_back_color"],
"inner_back_opacity": h["thumb"]["inner_back_opacity"],
},
"track": {
"back_color": h["track"]["back_color"],
"back_opacity": h["track"]["back_opacity"],
"width": h["track"]["width"],
},
"rail": {
"back_color": h["rail"]["back_color"],
"back_opacity": h["rail"]["back_opacity"],
},
},
pressed={
"radius": p["radius"],
"thumb": {
"radius": p["thumb"]["radius"],
"inner_radius": p["thumb"]["inner_radius"],
"width": r["thumb"]["width"],
"back_color": p["thumb"]["back_color"],
"back_opacity": p["thumb"]["back_opacity"],
"border_color": p["thumb"]["border_color"],
"border_color_opacity": p["thumb"]["border_color_opacity"],
"border_color2": p["thumb"]["border_color2"],
"border_color2_opacity": p["thumb"]["border_color2_opacity"],
"inner_back_color": p["thumb"]["inner_back_color"],
"inner_back_opacity": p["thumb"]["inner_back_opacity"],
},
"track": {
"back_color": p["track"]["back_color"],
"back_opacity": p["track"]["back_opacity"],
"width": p["track"]["width"],
},
"rail": {
"back_color": p["rail"]["back_color"],
"back_opacity": p["rail"]["back_opacity"],
},
},
disabled={
"radius": d["radius"],
"thumb": {
"radius": d["thumb"]["radius"],
"inner_radius": d["thumb"]["inner_radius"],
"width": r["thumb"]["width"],
"back_color": d["thumb"]["back_color"],
"back_opacity": d["thumb"]["back_opacity"],
"border_color": d["thumb"]["border_color"],
"border_color_opacity": d["thumb"]["border_color_opacity"],
"border_color2": d["thumb"]["border_color2"],
"border_color2_opacity": d["thumb"]["border_color2_opacity"],
"inner_back_color": d["thumb"]["inner_back_color"],
"inner_back_opacity": d["thumb"]["inner_back_opacity"],
},
"track": {
"back_color": d["track"]["back_color"],
"back_opacity": d["track"]["back_opacity"],
"width": d["track"]["width"],
},
"rail": {
"back_color": d["rail"]["back_color"],
"back_opacity": d["rail"]["back_opacity"],
},
},
)
def _light(self):
self._theme("light")
def _dark(self):
self._theme("dark")
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