tuikit/layout.py
author Radek Brich <radek.brich@devl.cz>
Sat, 29 Dec 2012 12:16:06 +0100
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Update Emitter: All event handlers now have exactly one argument: object inherited from Event class, which carries any data.
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# -*- coding: utf-8 -*-
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'''layout module
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VerticalLayout
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HorizontalLayout
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TableLayout
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'''
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import math
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from tuikit.common import Rect
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class Layout:
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    def __init__(self):
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        self._container = None
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    @property
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    def container(self):
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        return self._container
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    @container.setter
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    def container(self, value):
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        self._container = value
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        self._container.connect('resize', self._on_container_resize)
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    def _on_container_resize(self, ev):
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        self.resize()
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    def _getchildren(self):
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        return [child for child in self.container.children
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            if child.allow_layout and not child.hidden]
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    def _getregion(self):
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        c = self.container
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        bl, bt, br, bb = c.borders
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        return Rect(bl, bt, c.width - bl - br, c.height - bt - bb)
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class LinearLayout(Layout):
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    def __init__(self, homogeneous=False, spacing=0):
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        super().__init__()
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        self.homogeneous = homogeneous
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        self.spacing = spacing
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    def _resize(self, ax1, ax2):
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        children = self._getchildren()
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        c = self.container
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        b1 = c.borders[ax1]
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        b2 = c.borders[ax2]
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        # available space
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        space1 = c.size[ax1] - b1 - c.borders[ax1+2]
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        space2 = c.size[ax2] - b2 - c.borders[ax2+2]
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        # all space minus spacing
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        space_to_divide = space1 - (len(children) - 1) * self.spacing
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        if not self.homogeneous:
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            # reduce by space acquired by children
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            space_to_divide -= sum([child.sizereq[ax1] for child in children])
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            # number of children with expanded hint
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            expanded_num = len([ch for ch in children if ch.hint('expand')])
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        else:
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            # all children are implicitly expanded
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            expanded_num = len(children)
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        if expanded_num:
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            # reserved space for each expanded child
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            space_child = space_to_divide / expanded_num
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        offset = 0.
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        for child in children:
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            child.position[ax1] = b1 + int(offset)
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            child.position[ax2] = b2
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            child.size[ax1] = child.sizereq[ax1]
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            child.size[ax2] = space2
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            if child.hint('expand') or self.homogeneous:
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                maxsize = int(round(space_child + math.modf(offset)[0], 2))
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                offset += space_child + self.spacing
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                if not self.homogeneous:
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                    maxsize += child.sizereq[ax1]
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                    offset += child.sizereq[ax1]
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                if child.hint('fill'):
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                    child.size[ax1] = maxsize
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                else:
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                    child.position[ax1] += int((maxsize - child.size[ax1])/2)
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            else:
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                offset += child.size[ax1]
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            child.emit('resize')
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        c.redraw()
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class VerticalLayout(LinearLayout):
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    def resize(self):
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        ax1 = 1 # primary dimension - y
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        ax2 = 0 # secondary dimension - x
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        self._resize(ax1, ax2)
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class HorizontalLayout(LinearLayout):
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    def resize(self):
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        ax1 = 0 # primary dimension - x
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        ax2 = 1 # secondary dimension - y
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        self._resize(ax1, ax2)
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class GridLayout(Layout):
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    def __init__(self, numcols=2):
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        super().__init__()
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        self.numcols = numcols
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    def _fillgrid(self):
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        ''' fill grid with widgeds '''
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        self._grid = []
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        rown = 0
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        coln = 0
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        for child in self._getchildren():
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            if coln == 0:
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   123
                row = []
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f69a1f0382ce Partial DriverPygame.putch() implementation. Add patch for PyGame implementing font.render_glyph(). Add test for PyGame font module. Add special key definitions to DriverPygame.
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                for _i in range(self.numcols):
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   125
                    row.append({'widget': None, 'colspan': 0, 'rowspan': 0})
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            colspan = 1
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   128
            if 'colspan' in child.hints:
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                colspan = child.hints['colspan']
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            colspan = min(colspan, self.numcols - coln + 1)
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            row[coln]['widget'] = child
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   133
            row[coln]['colspan'] = colspan
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   135
            coln += colspan
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   136
            if coln >= self.numcols:
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                coln = 0
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                self._grid.append(row)
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   139
                rown += 1
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        # autospan last child
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        if coln > 0:
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            row[coln-1]['colspan'] = self.numcols - coln + 1
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            self._grid.append(row)
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   147
    def _computesizes(self):
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   148
        self._colminw = [0] * self.numcols
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        # compute min column width for all widgets with colspan = 1
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        for row in self._grid:
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            for coln in range(self.numcols):
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                w = row[coln]['widget']
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   154
                if row[coln]['colspan'] == 1:
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                    self._colminw[coln] = max(w.sizemin[0], self._colminw[coln])
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   157
        # adjust min width for widgets with colspan > 1
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   158
        for row in self._grid:
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            for coln in range(self.numcols):
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   160
                w = row[coln]['widget']
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   161
                colspan = row[coln]['colspan']
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   162
                if colspan > 1:
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   163
                    # find min width over spanned columns
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   164
                    totalminw = 0
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                    for i in range(colspan):
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   166
                        totalminw += self._colminw[coln + i]
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   167
                    # check if spanned widget fits in
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   168
                    if w.sizemin[0] > totalminw:
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   169
                        # need to adjust colminw
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   170
                        addspace = w.sizemin[0] - totalminw
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   171
                        addall = addspace // colspan
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   172
                        rest = addspace % colspan
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                        for i in range(colspan):
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   174
                            self._colminw[coln + i] += addall
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                            if i < rest:
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   176
                                self._colminw[coln + i] += 1
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        self._rowminh = [0] * len(self._grid)
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   179
        rown = 0
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   180
        for row in self._grid:
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            for col in row:
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                w = col['widget']
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   183
                if w is not None:
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   184
                    self._rowminh[rown] = max(self._rowminh[rown], w.sizemin[1])
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   185
            rown += 1
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   187
        self._gridminw = sum(self._colminw)
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        self._gridminh = sum(self._rowminh)
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    def resize(self):
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        self._fillgrid()
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        self._computesizes()
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        # enlarge container if needed
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        lreg = self._getregion() # layout region
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        cont = self.container
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        bl, bt, br, bb = cont.borders
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        if self._gridminw > lreg.w:
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            cont.width = self._gridminw + bl + br
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        if self._gridminh > lreg.h:
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            cont.height = self._gridminh + bt + bb
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        # compute actual width of columns
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        colw = [0] * self.numcols
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        lreg = self._getregion() # layout region
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        restw = lreg.w - self._gridminw
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        resth = lreg.h - self._gridminh
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        for c in range(self.numcols):
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            colw[c] = self._colminw[c] + restw // self.numcols
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            if c < restw % self.numcols:
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                colw[c] += 1
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        # place widgets
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        colx = lreg.x
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        coly = lreg.y
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        rown = 0
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        numrows = len(self._grid)
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        for row in self._grid:
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            coln = 0
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            rowh = self._rowminh[rown] + resth // numrows
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            if rown < resth % numrows:
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                rowh += 1
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            for col in row:
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                w = col['widget']
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                if w is not None:
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                    w.x = colx
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                    w.y = coly
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                    w.width = colw[coln]
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                    w.height = rowh
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                    w.emit('resize')
5
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                    colspan = col['colspan']
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                    if colspan > 1:
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                        for i in range(1,colspan):
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                            w.width += colw[coln + i]
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                colx += colw[coln]
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            rown += 1
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            colx = lreg.x
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            coly += rowh
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        cont.redraw()
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c55b4749e562 Add Pager.
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