+/* static */
+int wxControlBase::FindAccelIndex(const wxString& label, wxString *labelOnly)
+{
+ // the character following MNEMONIC_PREFIX is the accelerator for this
+ // control unless it is MNEMONIC_PREFIX too - this allows to insert
+ // literal MNEMONIC_PREFIX chars into the label
+ static const wxChar MNEMONIC_PREFIX = wxT('&');
+
+ if ( labelOnly )
+ {
+ labelOnly->Empty();
+ labelOnly->Alloc(label.length());
+ }
+
+ int indexAccel = -1;
+ for ( wxString::const_iterator pc = label.begin(); pc != label.end(); ++pc )
+ {
+ if ( *pc == MNEMONIC_PREFIX )
+ {
+ ++pc; // skip it
+ if ( pc == label.end() )
+ break;
+ else if ( *pc != MNEMONIC_PREFIX )
+ {
+ if ( indexAccel == -1 )
+ {
+ // remember it (-1 is for MNEMONIC_PREFIX itself
+ indexAccel = pc - label.begin() - 1;
+ }
+ else
+ {
+ wxFAIL_MSG(wxT("duplicate accel char in control label"));
+ }
+ }
+ }
+
+ if ( labelOnly )
+ {
+ *labelOnly += *pc;
+ }
+ }
+
+ return indexAccel;
+}
+
+wxBorder wxControlBase::GetDefaultBorder() const
+{
+ return wxBORDER_THEME;
+}
+
+/* static */ wxVisualAttributes
+wxControlBase::GetCompositeControlsDefaultAttributes(wxWindowVariant WXUNUSED(variant))
+{
+ wxVisualAttributes attrs;
+ attrs.font = wxSystemSettings::GetFont(wxSYS_DEFAULT_GUI_FONT);
+ attrs.colFg = wxSystemSettings::GetColour(wxSYS_COLOUR_WINDOWTEXT);
+ attrs.colBg = wxSystemSettings::GetColour(wxSYS_COLOUR_WINDOW);
+
+ return attrs;
+}
+
+// ----------------------------------------------------------------------------
+// wxControlBase - ellipsization code
+// ----------------------------------------------------------------------------
+
+#define wxELLIPSE_REPLACEMENT wxS("...")
+
+/* static and protected */
+wxString wxControlBase::DoEllipsizeSingleLine(const wxString& curLine, const wxDC& dc,
+ wxEllipsizeMode mode, int maxFinalWidthPx,
+ int replacementWidthPx, int marginWidthPx)
+{
+ wxASSERT_MSG(replacementWidthPx > 0 && marginWidthPx > 0,
+ "Invalid parameters");
+ wxASSERT_LEVEL_2_MSG(!curLine.Contains('\n'),
+ "Use Ellipsize() instead!");
+
+ wxASSERT_MSG( mode != wxELLIPSIZE_NONE, "shouldn't be called at all then" );
+
+ // NOTE: this function assumes that any mnemonic/tab character has already
+ // been handled if it was necessary to handle them (see Ellipsize())
+
+ if (maxFinalWidthPx <= 0)
+ return wxEmptyString;
+
+ wxArrayInt charOffsetsPx;
+ size_t len = curLine.length();
+ if (len == 0 ||
+ !dc.GetPartialTextExtents(curLine, charOffsetsPx))
+ return curLine;
+
+ wxASSERT(charOffsetsPx.GetCount() == len);
+
+ // NOTE: charOffsetsPx[n] is the width in pixels of the first n characters (with the last one INCLUDED)
+ // thus charOffsetsPx[len-1] is the total width of the string
+ size_t totalWidthPx = charOffsetsPx.Last();
+ if ( totalWidthPx <= (size_t)maxFinalWidthPx )
+ return curLine; // we don't need to do any ellipsization!
+
+ int excessPx = wxMin(totalWidthPx - maxFinalWidthPx +
+ replacementWidthPx +
+ marginWidthPx, // security margin
+ totalWidthPx);
+ wxASSERT(excessPx>0); // excessPx should be in the [1;totalWidthPx] range
+
+ // REMEMBER: indexes inside the string have a valid range of [0;len-1] if not otherwise constrained
+ // lengths/counts of characters (e.g. nCharsToRemove) have a valid range of [0;len] if not otherwise constrained
+ // NOTE: since this point we know we have for sure a non-empty string from which we need
+ // to remove _at least_ one character (thus nCharsToRemove below is constrained to be >= 1)
+
+ size_t initialCharToRemove, // index of first character to erase, valid range is [0;len-1]
+ nCharsToRemove; // how many chars do we need to erase? valid range is [1;len-initialCharToRemove]
+
+ // let's compute the range of characters to remove depending on the ellipsization mode:
+ switch (mode)
+ {
+ case wxELLIPSIZE_START:
+ initialCharToRemove = 0;
+ for ( nCharsToRemove = 1;
+ nCharsToRemove < len && charOffsetsPx[nCharsToRemove-1] < excessPx;
+ nCharsToRemove++ )
+ ;
+ break;
+
+ case wxELLIPSIZE_MIDDLE:
+ {
+ // NOTE: the following piece of code works also when len == 1
+
+ // start the removal process from the middle of the string
+ // i.e. separe the string in three parts:
+ // - the first one to preserve, valid range [0;initialCharToRemove-1] or the empty range if initialCharToRemove==0
+ // - the second one to remove, valid range [initialCharToRemove;endCharToRemove]
+ // - the third one to preserve, valid range [endCharToRemove+1;len-1] or the empty range if endCharToRemove==len-1
+ // NOTE: empty range != range [0;0] since the range [0;0] contains 1 character (the zero-th one)!
+ initialCharToRemove = len/2;
+ size_t endCharToRemove = len/2; // index of the last character to remove; valid range is [0;len-1]
+
+ int removedPx = 0;
+ for ( ; removedPx < excessPx; )
+ {
+ // try to remove the last character of the first part of the string
+ if (initialCharToRemove > 0)
+ {
+ // width of the (initialCharToRemove-1)-th character
+ int widthPx;
+ if (initialCharToRemove >= 2)
+ widthPx = charOffsetsPx[initialCharToRemove-1] - charOffsetsPx[initialCharToRemove-2];
+ else
+ widthPx = charOffsetsPx[initialCharToRemove-1];
+ // the (initialCharToRemove-1)-th character is the first char of the string
+
+ wxASSERT(widthPx >= 0); // widthPx is zero for e.g. tab characters
+
+ // mark the (initialCharToRemove-1)-th character as removable
+ initialCharToRemove--;
+ removedPx += widthPx;
+ }
+
+ // try to remove the first character of the last part of the string
+ if (endCharToRemove < len - 1 &&
+ removedPx < excessPx)
+ {
+ // width of the (endCharToRemove+1)-th character
+ int widthPx = charOffsetsPx[endCharToRemove+1] -
+ charOffsetsPx[endCharToRemove];
+
+ wxASSERT(widthPx >= 0); // widthPx is zero for e.g. tab characters
+
+ // mark the (endCharToRemove+1)-th character as removable
+ endCharToRemove++;
+ removedPx += widthPx;
+ }
+
+ if (initialCharToRemove == 0 && endCharToRemove == len-1)
+ {
+ // we need to remove all the characters of the string!
+ break;
+ }
+ }
+
+ nCharsToRemove = endCharToRemove - initialCharToRemove + 1;
+ }
+ break;
+
+ case wxELLIPSIZE_END:
+ {
+ int maxWidthPx = totalWidthPx - excessPx;
+
+ // go backward from the end of the string toward the start
+ for ( initialCharToRemove = len-1;
+ initialCharToRemove > 0 && charOffsetsPx[initialCharToRemove-1] > maxWidthPx;
+ initialCharToRemove-- )
+ ;
+ nCharsToRemove = len - initialCharToRemove;
+ }
+ break;
+
+ case wxELLIPSIZE_NONE:
+ default:
+ wxFAIL_MSG("invalid ellipsize mode");
+ return curLine;
+ }
+
+#ifdef __VMS
+#pragma message disable unscomzer
+ // suppress warnings on comparison of unsigned numbers
+#endif
+ wxASSERT(initialCharToRemove >= 0 && initialCharToRemove <= len-1); // see valid range for initialCharToRemove above
+#ifdef __VMS
+#pragma message enable unscomzer
+ // suppress warnings on comparison of unsigned numbers
+#endif
+ wxASSERT(nCharsToRemove >= 1 && nCharsToRemove <= len-initialCharToRemove); // see valid range for nCharsToRemove above
+
+ // erase nCharsToRemove characters after initialCharToRemove (included);
+ // e.g. if we have the string "foobar" (len = 6)
+ // ^
+ // \--- initialCharToRemove = 2
+ // and nCharsToRemove = 2, then we get "foar"
+ wxString ret(curLine);
+ ret.erase(initialCharToRemove, nCharsToRemove);
+
+ int removedPx;
+ if (initialCharToRemove >= 1)
+ removedPx = charOffsetsPx[initialCharToRemove+nCharsToRemove-1] - charOffsetsPx[initialCharToRemove-1];
+ else
+ removedPx = charOffsetsPx[initialCharToRemove+nCharsToRemove-1];
+ wxASSERT(removedPx >= excessPx);
+
+ // if there is space for the replacement dots, add them
+ if ((int)totalWidthPx-removedPx+replacementWidthPx < maxFinalWidthPx)
+ ret.insert(initialCharToRemove, wxELLIPSE_REPLACEMENT);
+
+ // if everything was ok, we should have shortened this line
+ // enough to make it fit in maxFinalWidthPx:
+ wxASSERT_LEVEL_2(dc.GetTextExtent(ret).GetWidth() <= maxFinalWidthPx);
+
+ return ret;
+}
+
+/* static */
+wxString wxControlBase::Ellipsize(const wxString& label, const wxDC& dc,
+ wxEllipsizeMode mode, int maxFinalWidth,
+ int flags)
+{
+ wxString ret;
+
+ // these cannot be cached between different Ellipsize() calls as they can
+ // change because of e.g. a font change; however we calculate them only once
+ // when ellipsizing multiline labels:
+ int replacementWidth = dc.GetTextExtent(wxELLIPSE_REPLACEMENT).GetWidth();
+ int marginWidth = dc.GetCharWidth();
+
+ // NB: we must handle correctly labels with newlines:
+ wxString curLine;
+ for ( wxString::const_iterator pc = label.begin(); ; ++pc )
+ {
+ if ( pc == label.end() || *pc == wxS('\n') )
+ {
+ curLine = DoEllipsizeSingleLine(curLine, dc, mode, maxFinalWidth,
+ replacementWidth, marginWidth);
+
+ // add this (ellipsized) row to the rest of the label
+ ret << curLine;
+ if ( pc == label.end() )
+ {
+ // NOTE: this is the return which always exits the function
+ return ret;
+ }
+ else
+ {
+ ret << *pc;
+ curLine.clear();
+ }
+ }
+ // we need to remove mnemonics from the label for correct calculations
+ else if ( *pc == wxS('&') && (flags & wxELLIPSIZE_FLAGS_PROCESS_MNEMONICS) )
+ {
+ // pc+1 is safe: at worst we'll be at end()
+ wxString::const_iterator next = pc + 1;
+ if ( next != label.end() && *next == wxS('&') )
+ curLine += wxS('&'); // && becomes &
+ //else: remove this ampersand
+ }
+ // we need also to expand tabs to properly calc their size
+ else if ( *pc == wxS('\t') && (flags & wxELLIPSIZE_FLAGS_EXPAND_TABS) )
+ {
+ // Windows natively expands the TABs to 6 spaces. Do the same:
+ curLine += wxS(" ");
+ }
+ else
+ {
+ curLine += *pc;
+ }
+ }
+
+ // this return would generate a
+ // warning C4702: unreachable code
+ // with MSVC since the function always exits from inside the loop
+ //return ret;
+}
+
+
+
projects / wxWidgets.git / blobdiff