scintilla/CallTip.cxx

   1 // Scintilla source code edit control
   2 /** @file CallTip.cxx
   3  ** Code for displaying call tips.
   4  **/
   5 // Copyright 1998-2001 by Neil Hodgson <neilh@scintilla.org>
   6 // The License.txt file describes the conditions under which this software may be distributed.
   7
   8 #include <stdlib.h>
   9 #include <string.h>
  10
  11 #include "Platform.h"
  12
  13 #include "Scintilla.h"
  14 #include "CallTip.h"
  15 #include <stdio.h>
  16
  17 #ifdef SCI_NAMESPACE
  18 using namespace Scintilla;
  19 #endif
  20
  21 static const int insetX = 5;    // text inset in x from calltip border
  22 static const int widthArrow = 14;
  23
  24 CallTip::CallTip() {
  25         wCallTip = 0;
  26         inCallTipMode = false;
  27         posStartCallTip = 0;
  28         val = 0;
  29         rectUp = PRectangle(0,0,0,0);
  30         rectDown = PRectangle(0,0,0,0);
  31         lineHeight = 1;
  32         startHighlight = 0;
  33         endHighlight = 0;
  34         tabSize = 0;
  35         useStyleCallTip = false;    // for backwards compatibility
  36
  37 #ifdef __APPLE__
  38         // proper apple colours for the default
  39         colourBG.desired = ColourDesired(0xff, 0xff, 0xc6);
  40         colourUnSel.desired = ColourDesired(0, 0, 0);
  41 #else
  42         colourBG.desired = ColourDesired(0xff, 0xff, 0xff);
  43         colourUnSel.desired = ColourDesired(0x80, 0x80, 0x80);
  44 #endif
  45         colourSel.desired = ColourDesired(0, 0, 0x80);
  46         colourShade.desired = ColourDesired(0, 0, 0);
  47         colourLight.desired = ColourDesired(0xc0, 0xc0, 0xc0);
  48 }
  49
  50 CallTip::~CallTip() {
  51         font.Release();
  52         wCallTip.Destroy();
  53         delete []val;
  54         val = 0;
  55 }
  56
  57 void CallTip::RefreshColourPalette(Palette &pal, bool want) {
  58         pal.WantFind(colourBG, want);
  59         pal.WantFind(colourUnSel, want);
  60         pal.WantFind(colourSel, want);
  61         pal.WantFind(colourShade, want);
  62         pal.WantFind(colourLight, want);
  63 }
  64
  65 // Although this test includes 0, we should never see a \0 character.
  66 static bool IsArrowCharacter(char ch) {
  67         return (ch == 0) || (ch == '\001') || (ch == '\002');
  68 }
  69
  70 // We ignore tabs unless a tab width has been set.
  71 bool CallTip::IsTabCharacter(char ch) const {
  72         return (tabSize > 0) && (ch == '\t');
  73 }
  74
  75 int CallTip::NextTabPos(int x) {
  76         if (tabSize > 0) {              // paranoia... not called unless this is true
  77                 x -= insetX;                // position relative to text
  78                 x = (x + tabSize) / tabSize;  // tab "number"
  79                 return tabSize*x + insetX;  // position of next tab
  80         } else {
  81                 return x + 1;                 // arbitrary
  82         }
  83 }
  84
  85 // Draw a section of the call tip that does not include \n in one colour.
  86 // The text may include up to numEnds tabs or arrow characters.
  87 void CallTip::DrawChunk(Surface *surface, int &x, const char *s,
  88         int posStart, int posEnd, int ytext, PRectangle rcClient,
  89         bool highlight, bool draw) {
  90         s += posStart;
  91         int len = posEnd - posStart;
  92
  93         // Divide the text into sections that are all text, or that are
  94         // single arrows or single tab characters (if tabSize > 0).
  95         int maxEnd = 0;
  96         const int numEnds = 10;
  97         int ends[numEnds + 2];
  98         for (int i=0; i<len; i++) {
  99                 if ((maxEnd < numEnds) &&
 100                         (IsArrowCharacter(s[i]) || IsTabCharacter(s[i])) ) {
 101                         if (i > 0)
 102                                 ends[maxEnd++] = i;
 103                         ends[maxEnd++] = i+1;
 104                 }
 105         }
 106         ends[maxEnd++] = len;
 107         int startSeg = 0;
 108         int xEnd;
 109         for (int seg = 0; seg<maxEnd; seg++) {
 110                 int endSeg = ends[seg];
 111                 if (endSeg > startSeg) {
 112                         if (IsArrowCharacter(s[startSeg])) {
 113                                 bool upArrow = s[startSeg] == '\001';
 114                                 rcClient.left = x;
 115                                 rcClient.right = rcClient.left + widthArrow;
 116                                 if (draw) {
 117                                         const int halfWidth = widthArrow / 2 - 3;
 118                                         const int centreX = rcClient.left + widthArrow / 2 - 1;
 119                                         const int centreY = (rcClient.top + rcClient.bottom) / 2;
 120                                         surface->FillRectangle(rcClient, colourBG.allocated);
 121                                         PRectangle rcClientInner(rcClient.left + 1, rcClient.top + 1,
 122                                                                  rcClient.right - 2, rcClient.bottom - 1);
 123                                         surface->FillRectangle(rcClientInner, colourUnSel.allocated);
 124
 125                                         if (upArrow) {      // Up arrow
 126                                                 Point pts[] = {
 127                                                 Point(centreX - halfWidth, centreY + halfWidth / 2),
 128                                                 Point(centreX + halfWidth, centreY + halfWidth / 2),
 129                                                 Point(centreX, centreY - halfWidth + halfWidth / 2),
 130                                                 };
 131                                                 surface->Polygon(pts, sizeof(pts) / sizeof(pts[0]),
 132                                                                 colourBG.allocated, colourBG.allocated);
 133                                         } else {            // Down arrow
 134                                                 Point pts[] = {
 135                                                 Point(centreX - halfWidth, centreY - halfWidth / 2),
 136                                                 Point(centreX + halfWidth, centreY - halfWidth / 2),
 137                                                 Point(centreX, centreY + halfWidth - halfWidth / 2),
 138                                                 };
 139                                                 surface->Polygon(pts, sizeof(pts) / sizeof(pts[0]),
 140                                                                 colourBG.allocated, colourBG.allocated);
 141                                         }
 142                                 }
 143                                 xEnd = rcClient.right;
 144                                 offsetMain = xEnd;
 145                                 if (upArrow) {
 146                                         rectUp = rcClient;
 147                                 } else {
 148                                         rectDown = rcClient;
 149                                 }
 150                         } else if (IsTabCharacter(s[startSeg])) {
 151                                 xEnd = NextTabPos(x);
 152                         } else {
 153                                 xEnd = x + surface->WidthText(font, s + startSeg, endSeg - startSeg);
 154                                 if (draw) {
 155                                         rcClient.left = x;
 156                                         rcClient.right = xEnd;
 157                                         surface->DrawTextTransparent(rcClient, font, ytext,
 158                                                                                 s+startSeg, endSeg - startSeg,
 159                                                                      highlight ? colourSel.allocated : colourUnSel.allocated);
 160                                 }
 161                         }
 162                         x = xEnd;
 163                         startSeg = endSeg;
 164                 }
 165         }
 166 }
 167
 168 int CallTip::PaintContents(Surface *surfaceWindow, bool draw) {
 169         PRectangle rcClientPos = wCallTip.GetClientPosition();
 170         PRectangle rcClientSize(0, 0, rcClientPos.right - rcClientPos.left,
 171                                 rcClientPos.bottom - rcClientPos.top);
 172         PRectangle rcClient(1, 1, rcClientSize.right - 1, rcClientSize.bottom - 1);
 173
 174         // To make a nice small call tip window, it is only sized to fit most normal characters without accents
 175         int ascent = surfaceWindow->Ascent(font) - surfaceWindow->InternalLeading(font);
 176
 177         // For each line...
 178         // Draw the definition in three parts: before highlight, highlighted, after highlight
 179         int ytext = rcClient.top + ascent + 1;
 180         rcClient.bottom = ytext + surfaceWindow->Descent(font) + 1;
 181         char *chunkVal = val;
 182         bool moreChunks = true;
 183         int maxWidth = 0;
 184
 185         while (moreChunks) {
 186                 char *chunkEnd = strchr(chunkVal, '\n');
 187                 if (chunkEnd == NULL) {
 188                         chunkEnd = chunkVal + strlen(chunkVal);
 189                         moreChunks = false;
 190                 }
 191                 int chunkOffset = chunkVal - val;
 192                 int chunkLength = chunkEnd - chunkVal;
 193                 int chunkEndOffset = chunkOffset + chunkLength;
 194                 int thisStartHighlight = Platform::Maximum(startHighlight, chunkOffset);
 195                 thisStartHighlight = Platform::Minimum(thisStartHighlight, chunkEndOffset);
 196                 thisStartHighlight -= chunkOffset;
 197                 int thisEndHighlight = Platform::Maximum(endHighlight, chunkOffset);
 198                 thisEndHighlight = Platform::Minimum(thisEndHighlight, chunkEndOffset);
 199                 thisEndHighlight -= chunkOffset;
 200                 rcClient.top = ytext - ascent - 1;
 201
 202                 int x = insetX;     // start each line at this inset
 203
 204                 DrawChunk(surfaceWindow, x, chunkVal, 0, thisStartHighlight,
 205                         ytext, rcClient, false, draw);
 206                 DrawChunk(surfaceWindow, x, chunkVal, thisStartHighlight, thisEndHighlight,
 207                         ytext, rcClient, true, draw);
 208                 DrawChunk(surfaceWindow, x, chunkVal, thisEndHighlight, chunkLength,
 209                         ytext, rcClient, false, draw);
 210
 211                 chunkVal = chunkEnd + 1;
 212                 ytext += lineHeight;
 213                 rcClient.bottom += lineHeight;
 214                 maxWidth = Platform::Maximum(maxWidth, x);
 215         }
 216         return maxWidth;
 217 }
 218
 219 void CallTip::PaintCT(Surface *surfaceWindow) {
 220         if (!val)
 221                 return;
 222         PRectangle rcClientPos = wCallTip.GetClientPosition();
 223         PRectangle rcClientSize(0, 0, rcClientPos.right - rcClientPos.left,
 224                                 rcClientPos.bottom - rcClientPos.top);
 225         PRectangle rcClient(1, 1, rcClientSize.right - 1, rcClientSize.bottom - 1);
 226
 227         surfaceWindow->FillRectangle(rcClient, colourBG.allocated);
 228
 229         offsetMain = insetX;    // initial alignment assuming no arrows
 230         PaintContents(surfaceWindow, true);
 231
 232 #ifndef __APPLE__
 233         // OSX doesn't put borders on "help tags"
 234         // Draw a raised border around the edges of the window
 235         surfaceWindow->MoveTo(0, rcClientSize.bottom - 1);
 236         surfaceWindow->PenColour(colourShade.allocated);
 237         surfaceWindow->LineTo(rcClientSize.right - 1, rcClientSize.bottom - 1);
 238         surfaceWindow->LineTo(rcClientSize.right - 1, 0);
 239         surfaceWindow->PenColour(colourLight.allocated);
 240         surfaceWindow->LineTo(0, 0);
 241         surfaceWindow->LineTo(0, rcClientSize.bottom - 1);
 242 #endif
 243 }
 244
 245 void CallTip::MouseClick(Point pt) {
 246         clickPlace = 0;
 247         if (rectUp.Contains(pt))
 248                 clickPlace = 1;
 249         if (rectDown.Contains(pt))
 250                 clickPlace = 2;
 251 }
 252
 253 PRectangle CallTip::CallTipStart(int pos, Point pt, const char *defn,
 254                                  const char *faceName, int size,
 255                                  int codePage_, int characterSet, Window &wParent) {
 256         clickPlace = 0;
 257         delete []val;
 258         val = 0;
 259         val = new char[strlen(defn) + 1];
 260         strcpy(val, defn);
 261         codePage = codePage_;
 262         Surface *surfaceMeasure = Surface::Allocate();
 263         if (!surfaceMeasure)
 264                 return PRectangle();
 265         surfaceMeasure->Init(wParent.GetID());
 266         surfaceMeasure->SetUnicodeMode(SC_CP_UTF8 == codePage);
 267         surfaceMeasure->SetDBCSMode(codePage);
 268         startHighlight = 0;
 269         endHighlight = 0;
 270         inCallTipMode = true;
 271         posStartCallTip = pos;
 272         int deviceHeight = surfaceMeasure->DeviceHeightFont(size);
 273         font.Create(faceName, characterSet, deviceHeight, false, false);
 274         // Look for multiple lines in the text
 275         // Only support \n here - simply means container must avoid \r!
 276         int numLines = 1;
 277         const char *newline;
 278         const char *look = val;
 279         rectUp = PRectangle(0,0,0,0);
 280         rectDown = PRectangle(0,0,0,0);
 281         offsetMain = insetX;            // changed to right edge of any arrows
 282         int width = PaintContents(surfaceMeasure, false) + insetX;
 283         while ((newline = strchr(look, '\n')) != NULL) {
 284                 look = newline + 1;
 285                 numLines++;
 286         }
 287         lineHeight = surfaceMeasure->Height(font);
 288
 289         // Extra line for border and an empty line at top and bottom. The returned
 290         // rectangle is aligned to the right edge of the last arrow encountered in
 291         // the tip text, else to the tip text left edge.
 292         int height = lineHeight * numLines - surfaceMeasure->InternalLeading(font) + 2 + 2;
 293         delete surfaceMeasure;
 294         return PRectangle(pt.x - offsetMain, pt.y + 1, pt.x + width - offsetMain, pt.y + 1 + height);
 295 }
 296
 297 void CallTip::CallTipCancel() {
 298         inCallTipMode = false;
 299         if (wCallTip.Created()) {
 300                 wCallTip.Destroy();
 301         }
 302 }
 303
 304 void CallTip::SetHighlight(int start, int end) {
 305         // Avoid flashing by checking something has really changed
 306         if ((start != startHighlight) || (end != endHighlight)) {
 307                 startHighlight = start;
 308                 endHighlight = end;
 309                 if (wCallTip.Created()) {
 310                         wCallTip.InvalidateAll();
 311                 }
 312         }
 313 }
 314
 315 // Set the tab size (sizes > 0 enable the use of tabs). This also enables the
 316 // use of the STYLE_CALLTIP.
 317 void CallTip::SetTabSize(int tabSz) {
 318         tabSize = tabSz;
 319         useStyleCallTip = true;
 320 }
 321
 322 // It might be better to have two access functions for this and to use
 323 // them for all settings of colours.
 324 void CallTip::SetForeBack(const ColourPair &fore, const ColourPair &back) {
 325         colourBG = back;
 326         colourUnSel = fore;
 327 }